125507domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p+2, p^2 - 2p + 2, and p^2 - 2p + 4 are all prime.at n=25A101315Number of primes p of the form k^2 + 1 less than 10^n such that p+2 and 2p+1 are also primes.at n=18A356364Primes that are the sum of some first primes minus one.at n=24A388261Prime numbersat n=11777