Identifier
Identifier
Values
0 => 0
1 => 0
00 => 1
01 => 0
10 => 0
11 => 1
000 => 1
001 => 1
010 => 0
011 => 1
100 => 1
101 => 0
110 => 1
111 => 1
0000 => 2
0001 => 1
0010 => 1
0011 => 2
0100 => 1
0101 => 1
0110 => 1
0111 => 1
1000 => 1
1001 => 1
1010 => 1
1011 => 1
1100 => 2
1101 => 1
1110 => 1
1111 => 2
00000 => 2
00001 => 2
00010 => 1
00011 => 2
00100 => 1
00101 => 2
00110 => 2
00111 => 2
01000 => 1
01001 => 1
01010 => 2
01011 => 2
01100 => 2
01101 => 1
01110 => 1
01111 => 2
10000 => 2
10001 => 1
10010 => 1
10011 => 2
10100 => 2
10101 => 2
10110 => 1
10111 => 1
11000 => 2
11001 => 2
11010 => 2
11011 => 1
11100 => 2
11101 => 1
11110 => 2
11111 => 2
000000 => 3
000001 => 2
000010 => 2
000011 => 3
000100 => 1
000101 => 2
000110 => 2
000111 => 2
001000 => 1
001001 => 2
001010 => 3
001011 => 3
001100 => 2
001101 => 2
001110 => 2
001111 => 3
010000 => 2
010001 => 1
010010 => 2
010011 => 2
010100 => 3
010101 => 2
010110 => 2
010111 => 2
011000 => 2
011001 => 2
011010 => 2
011011 => 2
011100 => 2
011101 => 1
011110 => 2
011111 => 2
100000 => 2
100001 => 2
100010 => 1
100011 => 2
100100 => 2
100101 => 2
100110 => 2
100111 => 2
101000 => 2
101001 => 2
101010 => 2
101011 => 3
101100 => 2
101101 => 2
101110 => 1
101111 => 2
110000 => 3
110001 => 2
110010 => 2
110011 => 2
110100 => 3
110101 => 3
110110 => 2
110111 => 1
111000 => 2
111001 => 2
111010 => 2
111011 => 1
111100 => 3
111101 => 2
111110 => 2
111111 => 3
0000000 => 3
0000001 => 3
0000010 => 2
0000011 => 3
0000100 => 2
0000101 => 3
0000110 => 3
0000111 => 3
0001000 => 1
0001001 => 2
0001010 => 3
0001011 => 3
0001100 => 2
0001101 => 2
0001110 => 2
0001111 => 3
0010000 => 2
0010001 => 1
0010010 => 3
0010011 => 3
0010100 => 3
0010101 => 3
0010110 => 3
0010111 => 3
0011000 => 2
0011001 => 2
0011010 => 3
0011011 => 3
0011100 => 2
0011101 => 2
0011110 => 3
0011111 => 3
0100000 => 2
0100001 => 2
0100010 => 1
0100011 => 2
0100100 => 3
0100101 => 3
0100110 => 2
0100111 => 2
0101000 => 3
0101001 => 3
0101010 => 2
0101011 => 3
0101100 => 3
0101101 => 3
0101110 => 2
0101111 => 3
0110000 => 3
0110001 => 2
0110010 => 2
0110011 => 2
0110100 => 3
0110101 => 3
0110110 => 3
0110111 => 2
0111000 => 2
0111001 => 2
0111010 => 2
0111011 => 1
0111100 => 3
0111101 => 2
0111110 => 2
0111111 => 3
1000000 => 3
1000001 => 2
1000010 => 2
1000011 => 3
1000100 => 1
1000101 => 2
1000110 => 2
1000111 => 2
1001000 => 2
1001001 => 3
1001010 => 3
1001011 => 3
1001100 => 2
1001101 => 2
1001110 => 2
1001111 => 3
1010000 => 3
1010001 => 2
1010010 => 3
1010011 => 3
1010100 => 3
1010101 => 2
1010110 => 3
1010111 => 3
1011000 => 2
1011001 => 2
1011010 => 3
1011011 => 3
1011100 => 2
1011101 => 1
1011110 => 2
1011111 => 2
1100000 => 3
1100001 => 3
1100010 => 2
1100011 => 2
1100100 => 3
1100101 => 3
1100110 => 2
1100111 => 2
1101000 => 3
1101001 => 3
1101010 => 3
1101011 => 3
1101100 => 3
1101101 => 3
1101110 => 1
1101111 => 2
1110000 => 3
1110001 => 2
1110010 => 2
1110011 => 2
1110100 => 3
1110101 => 3
1110110 => 2
1110111 => 1
1111000 => 3
1111001 => 3
1111010 => 3
1111011 => 2
1111100 => 3
1111101 => 2
1111110 => 3
1111111 => 3
00000000 => 4
00000001 => 3
00000010 => 3
00000011 => 4
00000100 => 2
00000101 => 3
00000110 => 3
00000111 => 3
00001000 => 2
00001001 => 3
00001010 => 4
00001011 => 4
00001100 => 3
00001101 => 3
00001110 => 3
00001111 => 4
00010000 => 2
00010001 => 2
00010010 => 3
00010011 => 3
00010100 => 3
00010101 => 3
00010110 => 3
00010111 => 3
00011000 => 2
00011001 => 2
00011010 => 3
00011011 => 3
00011100 => 2
00011101 => 2
00011110 => 3
00011111 => 3
00100000 => 2
00100001 => 2
00100010 => 2
00100011 => 2
00100100 => 4
00100101 => 4
00100110 => 3
00100111 => 3
00101000 => 3
00101001 => 3
00101010 => 3
00101011 => 4
00101100 => 3
00101101 => 4
00101110 => 3
00101111 => 4
00110000 => 3
00110001 => 2
00110010 => 2
00110011 => 3
00110100 => 3
00110101 => 4
00110110 => 4
00110111 => 3
00111000 => 2
00111001 => 2
00111010 => 3
00111011 => 2
00111100 => 3
00111101 => 3
00111110 => 3
00111111 => 4
01000000 => 3
01000001 => 2
01000010 => 2
01000011 => 3
01000100 => 2
01000101 => 2
01000110 => 2
01000111 => 2
01001000 => 3
01001001 => 4
01001010 => 4
01001011 => 4
01001100 => 2
01001101 => 2
01001110 => 2
01001111 => 3
01010000 => 4
01010001 => 3
01010010 => 4
01010011 => 4
01010100 => 3
01010101 => 3
01010110 => 3
01010111 => 3
01011000 => 3
01011001 => 3
01011010 => 4
01011011 => 4
01011100 => 3
01011101 => 2
01011110 => 3
01011111 => 3
01100000 => 3
01100001 => 3
01100010 => 2
01100011 => 2
01100100 => 3
01100101 => 3
01100110 => 3
01100111 => 2
01101000 => 3
01101001 => 3
01101010 => 3
01101011 => 3
01101100 => 4
01101101 => 4
01101110 => 2
01101111 => 3
01110000 => 3
01110001 => 2
01110010 => 2
01110011 => 2
01110100 => 3
01110101 => 3
01110110 => 2
01110111 => 2
01111000 => 3
01111001 => 3
01111010 => 3
01111011 => 2
01111100 => 3
01111101 => 2
01111110 => 3
01111111 => 3
10000000 => 3
10000001 => 3
10000010 => 2
10000011 => 3
10000100 => 2
10000101 => 3
10000110 => 3
10000111 => 3
10001000 => 2
10001001 => 2
10001010 => 3
10001011 => 3
10001100 => 2
10001101 => 2
10001110 => 2
10001111 => 3
10010000 => 3
10010001 => 2
10010010 => 4
10010011 => 4
10010100 => 3
10010101 => 3
10010110 => 3
10010111 => 3
10011000 => 2
10011001 => 3
10011010 => 3
10011011 => 3
10011100 => 2
10011101 => 2
10011110 => 3
10011111 => 3
10100000 => 3
10100001 => 3
10100010 => 2
10100011 => 3
10100100 => 4
10100101 => 4
10100110 => 3
10100111 => 3
10101000 => 3
10101001 => 3
10101010 => 3
10101011 => 3
10101100 => 4
10101101 => 4
10101110 => 3
10101111 => 4
10110000 => 3
10110001 => 2
10110010 => 2
10110011 => 2
10110100 => 4
10110101 => 4
10110110 => 4
10110111 => 3
10111000 => 2
10111001 => 2
10111010 => 2
10111011 => 2
10111100 => 3
10111101 => 2
10111110 => 2
10111111 => 3
11000000 => 4
11000001 => 3
11000010 => 3
11000011 => 3
11000100 => 2
11000101 => 3
11000110 => 2
11000111 => 2
11001000 => 3
11001001 => 4
11001010 => 4
11001011 => 3
11001100 => 3
11001101 => 2
11001110 => 2
11001111 => 3
11010000 => 4
11010001 => 3
11010010 => 4
11010011 => 3
11010100 => 4
11010101 => 3
11010110 => 3
11010111 => 3
11011000 => 3
11011001 => 3
11011010 => 4
11011011 => 4
11011100 => 2
11011101 => 2
11011110 => 2
11011111 => 2
11100000 => 3
11100001 => 3
11100010 => 2
11100011 => 2
11100100 => 3
11100101 => 3
11100110 => 2
11100111 => 2
11101000 => 3
11101001 => 3
11101010 => 3
11101011 => 3
11101100 => 3
11101101 => 3
11101110 => 2
11101111 => 2
11110000 => 4
11110001 => 3
11110010 => 3
11110011 => 3
11110100 => 4
11110101 => 4
11110110 => 3
11110111 => 2
11111000 => 3
11111001 => 3
11111010 => 3
11111011 => 2
11111100 => 4
11111101 => 3
11111110 => 3
11111111 => 4
000000000 => 4
000000001 => 4
000000010 => 3
000000011 => 4
000000100 => 3
000000101 => 4
000000110 => 4
000000111 => 4
000001000 => 2
000001001 => 3
000001010 => 4
000001011 => 4
000001100 => 3
000001101 => 3
000001110 => 3
000001111 => 4
000010000 => 2
000010001 => 3
000010010 => 4
000010011 => 4
000010100 => 4
000010101 => 4
000010110 => 4
000010111 => 4
000011000 => 3
000011001 => 3
000011010 => 4
000011011 => 4
000011100 => 3
000011101 => 3
000011110 => 4
000011111 => 4
000100000 => 2
000100001 => 2
000100010 => 3
000100011 => 3
000100100 => 4
000100101 => 4
000100110 => 3
000100111 => 3
000101000 => 3
000101001 => 3
000101010 => 3
000101011 => 4
000101100 => 3
000101101 => 4
000101110 => 3
000101111 => 4
000110000 => 3
000110001 => 2
000110010 => 2
000110011 => 3
000110100 => 3
000110101 => 4
000110110 => 4
000110111 => 3
000111000 => 2
000111001 => 2
000111010 => 3
000111011 => 2
000111100 => 3
000111101 => 3
000111110 => 3
000111111 => 4
001000000 => 3
001000001 => 2
001000010 => 2
001000011 => 3
001000100 => 3
001000101 => 3
001000110 => 2
001000111 => 2
001001000 => 4
001001001 => 4
001001010 => 5
001001011 => 5
001001100 => 3
001001101 => 3
001001110 => 3
001001111 => 4
001010000 => 4
001010001 => 3
001010010 => 4
001010011 => 4
001010100 => 3
001010101 => 4
001010110 => 4
001010111 => 4
001011000 => 3
001011001 => 3
001011010 => 5
001011011 => 5
001011100 => 3
001011101 => 3
001011110 => 4
001011111 => 4
001100000 => 3
001100001 => 3
001100010 => 2
001100011 => 2
001100100 => 3
001100101 => 3
001100110 => 4
001100111 => 3
001101000 => 3
001101001 => 3
001101010 => 4
001101011 => 4
001101100 => 4
001101101 => 5
001101110 => 3
001101111 => 4
001110000 => 3
001110001 => 2
001110010 => 2
001110011 => 2
001110100 => 3
001110101 => 4
001110110 => 3
001110111 => 3
001111000 => 3
001111001 => 3
001111010 => 4
001111011 => 3
001111100 => 3
001111101 => 3
001111110 => 4
001111111 => 4
010000000 => 3
010000001 => 3
010000010 => 2
010000011 => 3
010000100 => 2
010000101 => 3
010000110 => 3
010000111 => 3
010001000 => 3
010001001 => 3
010001010 => 3
010001011 => 3
010001100 => 2
010001101 => 2
010001110 => 2
010001111 => 3
010010000 => 4
010010001 => 3
010010010 => 4
010010011 => 5
010010100 => 4
010010101 => 4
010010110 => 4
010010111 => 4
010011000 => 2
010011001 => 3
010011010 => 3
010011011 => 3
010011100 => 2
010011101 => 2
010011110 => 3
010011111 => 3
010100000 => 4
010100001 => 4
010100010 => 3
010100011 => 4
010100100 => 5
010100101 => 4
010100110 => 4
010100111 => 4
010101000 => 3
010101001 => 3
010101010 => 4
010101011 => 4
010101100 => 4
010101101 => 4
010101110 => 3
010101111 => 4
010110000 => 4
010110001 => 3
010110010 => 3
010110011 => 3
010110100 => 5
010110101 => 4
010110110 => 5
010110111 => 4
010111000 => 3
010111001 => 3
010111010 => 3
010111011 => 3
010111100 => 4
010111101 => 3
010111110 => 3
010111111 => 4
011000000 => 4
011000001 => 3
011000010 => 3
011000011 => 3
011000100 => 2
011000101 => 3
011000110 => 2
011000111 => 2
011001000 => 3
011001001 => 4
011001010 => 4
011001011 => 3
011001100 => 4
011001101 => 3
011001110 => 2
011001111 => 3
011010000 => 4
011010001 => 3
011010010 => 4
011010011 => 3
011010100 => 4
011010101 => 3
011010110 => 3
011010111 => 3
011011000 => 4
011011001 => 4
011011010 => 5
011011011 => 4
011011100 => 3
011011101 => 3
011011110 => 3
011011111 => 3
011100000 => 3
011100001 => 3
011100010 => 2
011100011 => 2
011100100 => 3
011100101 => 3
011100110 => 2
011100111 => 2
011101000 => 3
011101001 => 3
011101010 => 3
011101011 => 3
011101100 => 3
011101101 => 3
011101110 => 3
011101111 => 3
011110000 => 4
011110001 => 3
011110010 => 3
011110011 => 3
011110100 => 4
011110101 => 4
011110110 => 3
011110111 => 2
011111000 => 3
011111001 => 3
011111010 => 3
011111011 => 2
011111100 => 4
011111101 => 3
011111110 => 3
011111111 => 4
100000000 => 4
100000001 => 3
100000010 => 3
100000011 => 4
100000100 => 2
100000101 => 3
100000110 => 3
100000111 => 3
100001000 => 2
100001001 => 3
100001010 => 4
100001011 => 4
100001100 => 3
100001101 => 3
100001110 => 3
100001111 => 4
100010000 => 3
100010001 => 3
100010010 => 3
100010011 => 3
100010100 => 3
100010101 => 3
100010110 => 3
100010111 => 3
100011000 => 2
100011001 => 2
100011010 => 3
100011011 => 3
100011100 => 2
100011101 => 2
100011110 => 3
100011111 => 3
100100000 => 3
100100001 => 3
100100010 => 3
100100011 => 3
100100100 => 4
100100101 => 5
100100110 => 4
100100111 => 4
100101000 => 3
100101001 => 3
100101010 => 3
100101011 => 4
100101100 => 3
100101101 => 4
100101110 => 3
100101111 => 4
100110000 => 3
100110001 => 2
100110010 => 3
100110011 => 4
100110100 => 3
100110101 => 4
100110110 => 4
100110111 => 3
100111000 => 2
100111001 => 2
100111010 => 3
100111011 => 2
100111100 => 3
100111101 => 3
100111110 => 3
100111111 => 4
101000000 => 4
101000001 => 3
101000010 => 3
101000011 => 4
101000100 => 3
101000101 => 3
101000110 => 3
101000111 => 3
101001000 => 4
101001001 => 5
101001010 => 4
101001011 => 5
101001100 => 3
101001101 => 3
101001110 => 3
101001111 => 4
101010000 => 4
101010001 => 3
101010010 => 4
101010011 => 4
101010100 => 4
101010101 => 4
101010110 => 3
101010111 => 3
101011000 => 4
101011001 => 4
101011010 => 4
101011011 => 5
101011100 => 4
101011101 => 3
101011110 => 4
101011111 => 4
101100000 => 3
101100001 => 3
101100010 => 2
101100011 => 2
101100100 => 3
101100101 => 3
101100110 => 3
101100111 => 2
101101000 => 4
101101001 => 4
101101010 => 4
101101011 => 4
101101100 => 5
101101101 => 4
101101110 => 3
101101111 => 4
101110000 => 3
101110001 => 2
101110010 => 2
101110011 => 2
101110100 => 3
101110101 => 3
101110110 => 3
101110111 => 3
101111000 => 3
101111001 => 3
101111010 => 3
101111011 => 2
101111100 => 3
101111101 => 2
101111110 => 3
101111111 => 3
110000000 => 4
110000001 => 4
110000010 => 3
110000011 => 3
110000100 => 3
110000101 => 4
110000110 => 3
110000111 => 3
110001000 => 3
110001001 => 3
110001010 => 4
110001011 => 3
110001100 => 2
110001101 => 2
110001110 => 2
110001111 => 3
110010000 => 4
110010001 => 3
110010010 => 5
110010011 => 4
110010100 => 4
110010101 => 4
110010110 => 3
110010111 => 3
110011000 => 3
110011001 => 4
110011010 => 3
110011011 => 3
110011100 => 2
110011101 => 2
110011110 => 3
110011111 => 3
110100000 => 4
110100001 => 4
110100010 => 3
110100011 => 3
110100100 => 5
110100101 => 5
110100110 => 3
110100111 => 3
110101000 => 4
110101001 => 4
110101010 => 4
110101011 => 3
110101100 => 4
110101101 => 4
110101110 => 3
110101111 => 4
110110000 => 4
110110001 => 3
110110010 => 3
110110011 => 3
110110100 => 5
110110101 => 5
110110110 => 4
110110111 => 4
110111000 => 2
110111001 => 2
110111010 => 3
110111011 => 3
110111100 => 3
110111101 => 2
110111110 => 2
110111111 => 3
111000000 => 4
111000001 => 3
111000010 => 3
111000011 => 3
111000100 => 2
111000101 => 3
111000110 => 2
111000111 => 2
111001000 => 3
111001001 => 4
111001010 => 4
111001011 => 3
111001100 => 3
111001101 => 2
111001110 => 2
111001111 => 3
111010000 => 4
111010001 => 3
111010010 => 4
111010011 => 3
111010100 => 4
111010101 => 3
111010110 => 3
111010111 => 3
111011000 => 3
111011001 => 3
111011010 => 4
111011011 => 4
111011100 => 3
111011101 => 3
111011110 => 2
111011111 => 2
111100000 => 4
111100001 => 4
111100010 => 3
111100011 => 3
111100100 => 4
111100101 => 4
111100110 => 3
111100111 => 3
111101000 => 4
111101001 => 4
111101010 => 4
111101011 => 4
111101100 => 4
111101101 => 4
111101110 => 3
111101111 => 2
111110000 => 4
111110001 => 3
111110010 => 3
111110011 => 3
111110100 => 4
111110101 => 4
111110110 => 3
111110111 => 2
111111000 => 4
111111001 => 4
111111010 => 4
111111011 => 3
111111100 => 4
111111101 => 3
111111110 => 4
111111111 => 4
click to show generating function       
Description
The number of distinct squares in a binary word.
A factor of a word is a sequence of consecutive letters. This statistic records the number of distinct non-empty words $u$ such that $uu$ is a factor of the word.
Note that every word of length at least four contains a square.
Code
def statistic(w):
    lst = []
    for i in range(len(w)):
        for l in range(1, (len(w)-i)//2+1):
            if w[i:i+l] == w[i+l:i+2*l]:
                lst.append(tuple(w[i:i+l]))
    return len(set(lst))

Created
Jun 20, 2019 at 00:28 by Martin Rubey
Updated
Jun 20, 2019 at 08:39 by Martin Rubey