46295domain: NAppears in sequencesPositive numbers y such that y^2 is of the form x^2+(x+47)^2 with integer x.at n=13A159750Integers k such that (2^k + 1) + (3^k + 1) + (5^k + 1) is prime.at n=19A268064Number of odd semiprimes less than 2^n.at n=18A362042