116119domain: NAppears in sequencesLet f(i) = prime( f(i - 1) (modulo 10^n) ) with f(0) = 1; a(n) is the term where the period of the sequence f(i) begins to repeat.at n=10A130172L.g.f.: Sum_{n>=1} (x^n/n)/sqrt(1 - 2*(2*x)^n) = Sum_{n>=1} a(n)*x^n/n.at n=8A184513