20586
domain: N
Appears in sequences
- a(n) = (7*n+1)*(7*n+6).at n=20A001526
- Base-9 palindromes that start with 3.at n=31A043030
- McKay-Thompson series of class 12F for Monster.at n=13A058484
- Number of ways to write n as sum of prime powers p^e such that e>0 and p does not divide n.at n=58A079412
- a(n) = (5*n+1)*(5*n+6).at n=28A085025
- Number of different deltoids (including squares) whose vertices are on an n X n grid.at n=38A159944
- Numbers n such that the following are six primes: 2*n^2 +- 1, 3*n^2 +- 1, 5*n^2 +- 1.at n=2A226461
- Number of partitions of n into prime power parts (not including 1) that do not divide n.at n=59A300580
- a(n) = 27*n^2 - 21*n + 6 (n>=1).at n=27A304164
- Number of smooth arithmetical structures on D_n.at n=37A335675
- Products of four distinct primes between sphenic numbers (products of 3 distinct primes).at n=10A351382
- Expansion of e.g.f. 1 / (5 - 4 * exp(x))^(3/2).at n=4A375950