1367857domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 648*k^2 - 72*k + 1.at n=10A154511Numbers k such that sigma((k + 1) / 2) is a prime q.at n=32A292446Primes p such that sigma((p + 1) / 2) is a prime q.at n=17A292447Prime numbersat n=104814