3450048domain: NAppears in sequencesG.f.: A(x) = x + x*ITERATE^2(x + 2*x*ITERATE^2(x + 3*x*ITERATE^2(x + 4*x*ITERATE^2(x + ...)))), where ITERATE^2(F(x)) = F(F(x)), and the nested iterations continue indefinitely.at n=7A195193Numbers n such that n - 31, n - 1, n + 1 and n + 31 are consecutive primes.at n=17A270754