56875

Appears in sequences

• A convolution triangle of numbers generalizing Pascal's triangle A007318.at n=51A049326
• Numbers k such that S(k)=d(k), where S(k) is the Kempner function (A002034) and d(k) is the number of divisors of k (A000005).at n=28A073307
• Numbers n such that number of divisors of n divides S(n), the Kempner function A002034.at n=39A073413
• a(1) = 1. For n > 1, a(n) = a(n-1) if n is prime, a(n) = a(n-1)/n if n is composite and divides a(n-1) else a(n) = n*a(n-1).at n=32A088304
• a(n) = binomial(n+2,3)*5^3.at n=12A141480