18510

Appears in sequences

• a(n) = n * prime(prime(n)).at n=29A080697
• Numbers k such that 2*6^k + 1 is prime.at n=30A120023
• G.f. satisfies: A(x) = (1+x*A(x))*(1+x^2*A(x))*(1+x^3*A(x)).at n=12A182053
• Number of strings of numbers x(i=1..5) in 0..n with sum i^3*x(i) equal to 125*n.at n=37A184260
• Number of ways to place 5 nonattacking grasshoppers on a toroidal chessboard of size n x n.at n=4A190400
• Number of Dyck paths of semilength n avoiding the pattern U^4 D^4 U D.at n=22A225691
• Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.at n=32A247376
• Expansion of Product_{k>=1} 1/(1 - x^k)^(k*(3*k-1)/2).at n=10A278768
• Numbers k such that Bernoulli number B_{k} has denominator 14322.at n=24A295588
• Number of colored integer partitions of n such that two colors are used and parts differ by size or by color.at n=29A327380
• Number of strictly-convex unit-sided polygons with all internal angles equal to a multiple of Pi/n, ignoring rotational and reflectional copies.at n=17A361635