926669domain: NPropertiesPrimalityPrimeyesAppears in sequencesInitial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.at n=23A059764Primes p such that 2p+1, 4p+3, 6p+5, 8p+7 are all primes.at n=27A107021Prime numbersat n=73238