55249domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest of four consecutive primes whose average is a triangular number.at n=27A226155Indices of Ulam prime triples, where u(k), u(k+1) and u(k+2) are all primes, and u(k) = A002858(k) are the Ulam numbers.at n=22A307330Primes p such that A001175(p) = (p-1)/8.at n=18A308793Prime numbersat n=5614