772432domain: NAppears in sequencesG.f.: 1 + 1*x/(1 + 2*x^2/(1 + 3*x^3/(1 + 4*x^4/(1 + 5*x^5/(1 + ...))))).at n=31A343468Numbers k such that in base 2 the k-th composite is a substring of the k-th prime.at n=27A378479