67043328

Appears in sequences

• Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,8)-perfect numbers.at n=15A019285
• Triangle read by rows: T(n,k) is the number of Boolean functions on n variables having an algebraic degree equal to k (for n >= 0 and 0 <= k <= n).at n=18A319511