18146

Appears in sequences

• Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=36A005905
• a(n) = (p^2 - p + 2)/2 for p = prime(n); number of squares modulo p^2.at n=42A072205
• Second binomial transform of expansion of exp(3cosh(x)).at n=7A081566
• Ceiling(4*Pi*n^2).at n=37A135971
• Twice 12-gonal numbers: a(n) = 2*n*(5*n-4).at n=43A152965
• Nearest integer to 4*Pi*n^2.at n=38A322615
• Numbers k such that the sums (with multiplicity) of prime factors of k and k+1 are both squares.at n=21A359445
• a(n) is the smallest positive integer which can be represented as the sum of distinct nonzero icosahedral numbers in exactly n ways, or -1 if no such integer exists.at n=10A360215