134857domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime p such that 257^n divides p^256 - 1.at n=2A125635Primes whose base-7 representation also is the base-3 representation of a prime.at n=39A235470Primes of the form (p^2 - p*q + q^2)/3, where p and q are consecutive primes.at n=17A342706Prime numbersat n=12565