1278720

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 (2,14)-perfect numbers.at n=1A019291
• The number of sets of n positive integers strictly less than 2*n such that no integer in the set divides another.at n=52A192298