-2012

Appears in sequences

• a(n) = 6^n - n^11.at n=2A024073
• A measure of how close r^n is to an integer where r is the real root of x^3-x-1, i.e.. r = (1/2 + sqrt(23/108))^(1/3) + (1/2 - sqrt(23/108))^(1/3) = 1.3247.... (Higher absolute value of a(n) means closer, negative means less than closest integer.)at n=56A084252
• Expansion of exp( Sum_{n>=1} -sigma_2(2*n)*x^n/n ) in powers of x.at n=13A283242
• Partial alternating sums of the sigma_2 function: a(n) = Sum_{k=1..n} (-1)^(k+1) * sigma_2(k).at n=38A379921