31156

Appears in sequences

• Numbers k such that 211*2^k+1 is prime.at n=10A032482
• Numbers n such that sum of squares of even digits of n equals sum of squares of odd digits of n.at n=30A076164
• Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle.at n=28A153904
• The number of permutations of length n sortable by 3 prefix block transpositions.at n=9A228395
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=2A253346
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=17A253350
• Number of (3+1)X(n+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=3A253352