241333domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that 54*p-1, 54*p+1 and 60*p-1, 60*p+1 are twin primes.at n=19A138698Centered 17-gonal (or heptadecagonal) primes.at n=28A264824The first of three consecutive primes the sum of which is equal to the sum of three consecutive heptagonal numbers.at n=9A298302Prime numbersat n=21330