158365domain: NAppears in sequencesG.f. satisfies: A(x) = 1/(1 + x*A(x^5)) and also the continued fraction: 1+x*A(x^6) = [1;1/x,1/x^5,1/x^25,1/x^125,...,1/x^(5^(n-1)),...].at n=46A101915Numbers n such that 4n+1, 4n+3, 4n+7, 4n+9 and 4n+13 are prime.at n=17A254376