27873

Appears in sequences

• Numbers n such that n divides 2^n^2 + 1.at n=23A093546
• Numbers k that divide 2^(k^3) + 1.at n=24A093665
• a(n) = sum of lengths of strings that can be generated by any starting string of n 2's and 3's, using the rule described in the Comments lines.at n=10A094005
• Coordination sequence for 18-dimensional cyclotomic lattice Z[zeta_27].at n=5A126920
• Numbers k such that k^3 divides 8^(k^2) + 1.at n=7A128681
• Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 6 ones in any 4 X 4 X 4 subtriangle.at n=7A153948
• Partial sums of A006343.at n=11A176074
• Diagonal sums of number triangle A184879.at n=19A184880
• Numbers generated by a Fibonacci-like sequence in which zeros are suppressed.at n=35A243063
• a(n) is the number of edges formed by n-secting the angles of a nonagon (enneagon).at n=28A335783