-641

Appears in sequences

• McKay-Thompson series of class 4C for the Monster group.at n=4A007248
• Expansion of 16/lambda(z) in powers of nome q = exp(Pi*i*z).at n=8A029845
• Coefficients of the '6th-order' mock theta function psi(q).at n=58A053269
• a(1) = 1, a(2n) = a(2n-1) + c(n) and a(2n+1) = a(2n) - p(n), where c(n)=A002808(n) and p(n)=A000040(n) are the n-th composite and n-th prime numbers, respectively.at n=54A073891
• McKay-Thompson series of class 8a for the Monster group.at n=4A112144
• Expansion of Fricke's 32*tau_4(z) in powers of q = exp(2*Pi*i*z).at n=8A124972
• INVERTi transform of d(n), A000005.at n=48A159933
• Primes or negative values of primes of the form 8*n^2 - 298*n + 2113 for n >= 0.at n=17A217439
• Primes or negative values of primes of the form 8*n^2 - 326*n + 2659 for n >= 0.at n=22A217440
• Values of n such that L(2) and N(2) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=12A226922
• Expansion of phi(-x^3) * f(-x, -x^5) / psi(x) in powers of x where phi(), psi(), f(, ) are Ramanujan theta functions.at n=19A262614
• Expansion of psi(x) * psi(x^9) * f(-x^3) / psi(x^3)^2 in powers of x where psi(), and f() are Ramanujan theta functions.at n=57A267852
• G.f.: Product_{m>0} (1-x^m+2!*x^(2*m)).at n=51A293072
• a(n) = [x^n] Product_{k>=1} ((1 + x^(2*k-1))/(1 + x^(2*k)))^n.at n=8A296043
• Expansion of 1 / Sum_{k>=0} x^(k*(3*k - 2)).at n=53A363275
• a(n) = A325977(A228058(n)).at n=41A389217