2500000001domain: NAppears in sequencesPrimes of the form 2^r*5^s + 1.at n=30A077497Primes 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=22A267143