52801
domain: N
Appears in sequences
- Strong pseudoprimes to base 27.at n=35A020253
- Composite n such that (n-1)*phi(n) is a perfect square.at n=32A069953
- 3-almost prime octagonal numbers.at n=28A129927
- a(n) = (n-2)^4 - a(n-1) - a(n-2), with a(1) = a(2) = 0.at n=20A152729
- Number of ways to place 4 nonattacking nightriders on a 4 X n board.at n=10A172219
- p*(p+2)/3 where p and p+4 are primes.at n=21A181093
- Odd octagonal numbers indexed by triangular numbers.at n=11A243201
- a(n) = n*(3*n - 2)*(9*n^2 - 6*n - 2).at n=7A264892
- a(n) = A005259(n) mod (n+1)^3.at n=38A289289
- Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 5 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=5 and b=-1, respectively.at n=37A337628
- Number of integer partitions of n whose rounded mean is > 1. Partitions with mean >= 3/2.at n=42A364059
- Octagonal numbers that are the product of three distinct primes.at n=23A382231