20894

Appears in sequences

• Expansion of E.g.f. exp(-x)/(1-3x).at n=5A000180
• Expansion of Molien series for 8-dimensional real Clifford group 2^{1+6}.Alt_8.2 of genus 3 and order 5160960.at n=53A024186
• Number of n-digit numbers with nonzero multiplicative digital root 6.at n=4A051817
• Least k >= 6 such that A087666(k) = n.at n=19A087710
• Duplicate of A087710.at n=19A088706
• Sum of column entries of the table with rows of prime numbers (2,3,0,0,...), (0,5,7,11,0,...), (0,0,13,17,19,23,0,...), (0,0,0,29,31,37,41,43,0,...), ...at n=26A238760
• Numbers k such that s(k) = s(k+1) but phi(k) != phi(k+1), where s(k) = phi(k) + phi(phi(k)) + ... + 1 is the sum of iterated phi (A092693).at n=12A291177
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of the e.g.f. exp(-x)/(1 - k*x).at n=41A320032
• Expansion of Sum_{k>0} (1/(1 - k*x^k)^2 - 1).at n=19A362683
• Number of partitions of n with rank 4 or higher (the rank of a partition is the largest part minus the number of parts).at n=42A363231
• Number of integer partitions of n with a different mean, median, and mode, assuming there is a unique mode.at n=43A363725
• Triangle read by rows: T(n, k) = n! * 3^k * hypergeom([-k], [-n], -1/3).at n=20A375446
• Number of equivalence classes of convex lattice polygons containing n lattice points, restricting the count to those polygons that are interior to another polygon.at n=47A377245