136889domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 3 iterations of function f(x) = 8x + 7.at n=34A023294Primes of form p*q - 2 where p and q are consecutive primes.at n=4A123921Primes of the form 10*k^2 - 1.at n=20A143828Prime numbersat n=12750