64510

Appears in sequences

• Numbers k such that k and k^2 have the same set of digits.at n=24A029793
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 5 and 6.at n=19A136855
• Number of (n+3) X 9 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.at n=15A188102
• a(n) = a(n-1) + a(n-2) + a([n/2]) + a([n/3]) + ... + a([n/n]), where a(0) = 1, a(1) = 2, a(2) = 3.at n=19A298357