131591domain: NPropertiesPrimalityPrimeyesAppears in sequencesStarting positions of strings of four 6's in the decimal expansion of Pi.at n=13A083626Primes whose representation in base 256 can be interpreted as a decimal prime.at n=20A090719Numbers k such that (38^k + 1)/39 is prime.at n=8A229524Prime numbersat n=12292