-6880

Appears in sequences

• Generalized sum of divisors function.at n=54A002130
• Expansion of 1/(1+2*x+2*x^2-2*x^3).at n=15A077991
• Real part of Gaussian amicable numbers in order of increasing magnitude. See A102925 for the imaginary part.at n=10A102924
• Expansion of g.f. 1/(1 - x + 2*x^3 + x^4).at n=21A112518