131383

Appears in sequences

• Numbers k such that 2^k + 21 is prime.at n=39A057201
• Number of ways to place two non-attacking rooks on all free n-ominoes.at n=9A171011
• Number of nX4 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=17A302511
• Numbers k such that sigma(k) = psi(k) + tau(k) + omega(k).at n=31A386637