229589domain: NPropertiesPrimalityPrimeyesAppears in sequencesPositive numbers y such that y^2 is of the form x^2+(x+2401)^2 with integer x.at n=28A157247Primes that are perimeter^2 + hypotenuse^2 of a Pythagorean triple.at n=12A391598Prime numbersat n=20398