38423

Appears in sequences

• Numbers k such that sum of divisors of k^2 is a square.at n=9A008847
• a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is an integer, s(0) = 0, |s(1)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2, s(n) = 2. Also a(n) = T(n,n-2), where T is the array defined in A025177.at n=10A025180
• a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026659.at n=15A026667
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 56.at n=6A031734
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.at n=13A146728
• Minimum number k for which the digital sum of k*n is 2*n.at n=26A147822
• a(n) = 49*n^2 + 7.at n=27A158481
• Odd numbers n such that sigma(sigma(n^2)) is odd.at n=2A234641
• Number of binary words of length n with exactly one occurrence of subword 010 and exactly two occurrences of subword 101.at n=19A260505
• Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=9A303237