210827009domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 2^r*7^s + 1.at n=21A077498Primes of the form x^x * y^y + 1.at n=8A228238Primes q such that Sum_(q-1; i=1..m) e(i)/p(i) is an integer k, where the prime factorization of n is Product_(n; i=1..m) p(i)^e(i).at n=19A267143Prime numbersat n=11644644