40678
domain: N
Appears in sequences
- Pentagonal pyramidal numbers: a(n) = n^2*(n+1)/2.at n=43A002411
- Even pentagonal pyramidal numbers.at n=32A015224
- Sum of terms of n-th row of A077583.at n=42A077660
- Sum of terms of n-th row of A077661.at n=42A077663
- a(n) = (n+1)*(2n+1)^2.at n=21A139757
- Number of nondecreasing -2..2 vectors of length n whose dot product with some nonincreasing -2..2 vector equals n.at n=35A226393
- Composites whose prime factorization in base 7 is an anagram of the number in base 7.at n=5A260051
- Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are < p/2.at n=36A282721
- a(n) = (3*n - 2)^2*(3*n - 1)/2.at n=14A386906