80320

Appears in sequences

• Numbers k not congruent to 0 (mod 3) such that phi(k) + 4 | sigma(k).at n=8A015806
• Cyclotomic polynomials Phi_n at x=phi, floored down (where phi = tau = (sqrt(5)+1)/2).at n=45A063703
• Constant term of the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.at n=10A192348
• a(n) = [x^n] Product_{k>=1} ((1 + x^(2*k-1))/(1 - x^(2*k)))^n.at n=9A296045
• Numbers k that divide the k-th Franel number.at n=36A372940