54485

Appears in sequences

• Numbers k such that sopf(k) = (1/2)*(sopf(k+1) + sopf(k-1)), where sopf(x) = sum of the distinct prime factors of x.at n=11A075846
• Number of subsets of {1, ..., n} that are neither double-free nor sum-free.at n=16A088812
• Squarefree products of factors of Fermat numbers (A023394).at n=21A094358
• 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, -1, 1), (0, 1, -1), (1, 0, 1), (1, 1, 1)}.at n=8A150829