39660

Appears in sequences

• Numbers in the cycle-attractors of length=14 of the function f(x)=A063919(x).at n=24A097030
• Number of primitive coronoid systems with n hexagons.at n=14A122672
• 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, 1, 1), (1, -1, -1), (1, 1, 1)}.at n=8A150686
• G.f.: A(x) = exp( Sum_{n>=1} A162552(n) * 2*A006519(n) * x^n/n ).at n=36A161803
• G.f.: Sum_{n>=0} Product_{k=1..n} (1 - (1-x)^k)/(1 - x^k).at n=9A207651
• Numbers k for which the sum of digits of sigma(k) = the product of digits of sigma(k).at n=22A277217
• Numbers that are members of unitary sigma aliquot cycles (union of unitary perfect, unitary amicable and unitary sociable numbers).at n=42A327157
• Irregular triangle of cycles of purely periodic unitary sigma aliquot sequences with their smallest member as starting number, read by rows.at n=42A336216