28902domain: NAppears in sequencesa(0) = 1, a(n) = 25*n^2 + 2 for n > 0.at n=34A010015a(n) is the least index such that the least primitive root of the a(n)-th prime is n, or zero if no such prime exists.at n=57A066529Members of 3-cycles of permutation A111273.at n=28A113701G.f.: Sum_{n>=1} x^n * (1+x)^n / (1-x^n).at n=21A227635