56608

Appears in sequences

• Numbers k such that sigma(k) = Sum_{j|k, j<k} sigma(j).at n=4A066218
• Numbers k such that 2^k + Fibonacci(k) is prime.at n=23A074824
• E.g.f.: -log(cos(x) - x).at n=7A201224
• Numbers k such that sigma(k) divides Sum_{d|k} sigma(d).at n=6A221219
• Numbers k such that if x = Sum_{j|k, j<k} (sigma(j) - j) then k = Sum_{j|x, j<x} (sigma(j) - j).at n=8A238765
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 185", based on the 5-celled von Neumann neighborhood.at n=41A270636
• a(n) = 2*n^3 + 9*n^2 + 9*n.at n=29A303609