64271domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^2 + k + 9.at n=27A027758Integers n of the form 8k+7 that are sum of distinct squares of the form m, m+1, m+2, m+4, where m == 1 (mod 4).at n=31A243578Primes having Fibonacci prime gaps to both neighbor primes.at n=17A353135Prime numbersat n=6435