6516224

Appears in sequences

• a(n) = sigma(sigma(...(sigma(n))...)) / n, where sigma (A000203) is iterated until a multiple of n is reached.at n=22A019295
• a(n) = sigma^m(N)/N for N = A019276(n) (megaperfect numbers), where m(N) = min {m: N | sigma^m(N)} reaches record values; sigma^m is m-fold iteration of A000203.at n=6A331035
• a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2*k+2,2*n-6*k+1).at n=28A387552