815413domain: NPropertiesPrimalityPrimeyesAppears in sequencesGreater of twin primes of the form x^2+2, x^2+4.at n=20A085554Primes p of the form x^2+4, such that either p-2 or p+2 is prime.at n=24A085555Least positive squarefree integer k such that Q(sqrt(k)) has a class number greater than that of any previous integer.at n=24A279908Prime numbersat n=65079