69661domain: NPropertiesPrimalityPrimeyesAppears in sequencesLeast k such that 2^(2^n)+k is prime.at n=20A129786Primes 6k + 1 at the end of the maximal gaps in A268925.at n=11A268927Primes 6k + 1 at the end of first-occurrence gaps in A330853.at n=18A330855Prime numbersat n=6908