1834560

Appears in sequences

• a(n) = sigma(sigma(...(sigma(n))...)) / n, where sigma (A000203) is iterated until a multiple of n is reached.at n=10A019295
• Number of divisors of n!.at n=29A027423
• Column 5 of triangle A055898.at n=12A055901
• Triangle read by rows, T(n, k) = Sum_{i=0..n} L'(n, n-i) * binomial(i, k), for k = 0..n-1.at n=33A059374
• Location of records in A099564.at n=27A099565
• Values of k corresponding to A111227.at n=1A111727
• Self-generating triangle based on symmetric functions.at n=20A203300
• Sum of distinct terms of A002674: a(0) = 0, a(2n) = A255411(A153880(a(n))), a(2n+1) = 1+A255411(A153880(a(n))).at n=24A275959
• Numbers m that divide sigma(sigma(m) - m) where sigma is the sum of divisors function (A000203).at n=35A300658
• 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=5A331035
• Numbers m such that the equation m = k*sigma(k) has more than one solution.at n=33A337873
• a(n) = H(n-1, n, n+1) where H(a, b, c) = (a + b + c)*(a + b - c)*(b + c - a)*(c + a - b) is Heron's polynomial.at n=28A339488
• Numbers k for which sigma(k - x) + sigma(k + x) = 9*k has at least one nonnegative solution.at n=14A385075