33874681domain: NPropertiesPrimalityPrimeyesAppears in sequencesValues of C (the hypotenuse) of a Pythagorean triangle with A (the short leg) and C both prime and part of a twin prime.at n=24A051859Primes p such that sigma(2p-1) is a prime q.at n=21A247789Prime numbersat n=2082208