122070312499domain: NAppears in sequencesSmallest prime p such that 5^n divides p^4 - 1.at n=14A125610Smallest odd prime base q such that p^15 divides q^(p-1) - 1, where p = prime(n).at n=2A133865a(n) = 4*5^n-1.at n=15A198763