342733domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form p^k - p^(k-1) + 1 for some prime p and integer k > 1.at n=30A087126a(n) = Sum_{k = 1..n} ( n/gcd(k, n) )^4.at n=12A372965Prime numbersat n=29402