318001domain: NPropertiesPrimalityPrimeyesAppears in sequencesCentered 25-gonal primes.at n=36A276264Number of von Neumann regular elements in the ring of 2 X 2 matrices over Z_n.at n=24A295071Primes of the form T(p) - 2 where T(p) is the triangular number (A000217) with prime index p in A357218.at n=33A357219Prime numbersat n=27442