75259

Appears in sequences

• a(n) = A051193(A072109(n))/A018804(A072109(n)).at n=7A071645
• Expansion of 1/((x-1)*(x+1)*(x^2+x+1)*(x^2+x-1)*(x^2-x+1)*(x^2+1)*(x^4-x^2+1)).at n=24A109609
• G.f. A(x) equals the limit of the composition of functions (x+x^n) in reverse order; let F_1(x) = x, F_{n+1}(x) = F_n(x) + F_n(x)^(n+1), then A(x) = limit F_n(x): A(x) = ...o x+x^n o ... o x+x^3 o x+x^2 o x.at n=13A119471
• Expansion of q * (psi(q^5) / psi(q))^2 in powers of q where psi() is a Ramanujan theta function.at n=34A138519
• Partial sums of the Fermat pseudoprimes to base 2, A001567.at n=20A172255
• Number of strings of numbers x(i=1..n) in 0..2 with sum i^2*x(i)^2 equal to n^2*4.at n=19A184233
• Constant term of the reduction by x^2->x+1 of the polynomial p(n,x)=1+x^(n+1)+x^(2n).at n=12A192474
• Expansion of q * (psi(-q^5) / psi(-q))^2 in powers of q where psi() is a Ramanujan theta function.at n=34A210458
• Expansion of 1 + q * (psi(-q^5) / psi(-q))^2 in powers of q where psi() is a Ramanujan theta function.at n=35A228864
• On a spirally numbered square grid, with labels starting at 1, this is the number of steps that a (1,n) leaper makes before getting trapped, or -1 if it never gets trapped.at n=14A323469