22641

Appears in sequences

• G.f.: A(x) = exp( Sum_{n>=1} 3*A038500(n) * x^n/n ), where A038500 is the highest power of 3 dividing n.at n=35A161809
• Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=19A173084
• Number of nX1 0..6 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=9A200930
• Number of genus 0 unsensed hypermaps with n darts.at n=8A214821
• Expansion of Product_{k>=1} 1/(1 - (5*k-2)*x^(5*k-2)).at n=27A265832
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 139", based on the 5-celled von Neumann neighborhood.at n=32A270280
• Partial sums of A299285.at n=20A299286
• Number of inequivalent convex lattice polygons containing n lattice points (including points on the boundary).at n=22A371917
• Truncated centered square numbers: a(n) = 14*n^2 - 22*n + 9.at n=40A389928