129220

Appears in sequences

• 15-gonal (or pentadecagonal) pyramidal numbers: a(n) = n*(n+1)*(13*n-10)/6.at n=39A177890
• Triangular array read by rows: T(n,k) is the number of partial permutations of {1,2,...,n} that have exactly k cycles, 0<=k<=n.at n=39A216294
• Numbers k such that N = k^6 is a twin rank (cf. A002822: 6N +- 1 are twin primes).at n=30A326236
• Total number of ways of partitioning n and any natural number less than n into the same number of parts.at n=20A380124