42692

Appears in sequences

• Numbers k such that k * (1+i)^k + 1 is a Gaussian prime.at n=26A058770
• Numbers n such that n * 2^(n/2) - 1 is prime.at n=14A058775
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 0, -1), (1, -1, 1), (1, 1, 0)}.at n=9A149277
• Number of ways to place zero or more nonadjacent 1,0 2,1 2,2 3,1 3,3 4,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155445
• G.f.: exp( Sum_{n>=1} A174478(n)*x^n/n ) where A174478(n) = Sum_{d|n} d*2^(n/d)*tau(d).at n=12A174477