61220

Appears in sequences

• Cubic star numbers: a(n) = n^3 + 4*Sum_{i=0..n-1} i^2.at n=30A051673
• Sum of the products of the first n prime pairs.at n=14A135232
• Numbers j > 1 at which the absolute difference between log(j)*log(A341651(j)) and the nearest integer reaches a record low.at n=21A341652
• Numbers k for which k = phi(k') + phi(k''), where phi is the Euler totient function (A000010), k' the arithmetic derivative of k (A003415) and k'' the second arithmetic derivative of k (A068346).at n=21A352332
• E.g.f. satisfies A(x) = (1 + x * exp(x*A(x)))^4.at n=5A377579