263040

Appears in sequences

• Numbers n such that (phi(n) + 1) | sigma(n + 1), where phi is Euler's totient function A000010.at n=11A015775
• Divide natural numbers in groups with prime(n) elements and add together.at n=32A034956
• Triangle of coefficients of Gandhi polynomials.at n=24A036970
• Another version of triangular array in A036970: triangle T(n,k), 0<=k<=n, read by rows; given by [0, 1, 2, 4, 6, 9, 12, 16, 20, 25, 30, ...] DELTA [1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, ...] where DELTA is the operator defined in A084938.at n=32A094346