200760

Appears in sequences

• Numbers k such that the sum of unitary divisors of k^2 is a square.at n=32A064498
• a(n) = 256*n^2 + 2*n.at n=27A158230
• Array read by downward antidiagonals: A(n,k) = -A(n-1,k) + (k+1)*A(n-1,k+1) + A(n-1,k+2) with A(0,k) = 1, n >= 0, k >= 0.at n=43A369292