487561domain: NPropertiesPrimalityPrimeyesAppears in sequencesExpansion of (1 +3*x -x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=14A114688Centered 17-gonal (or heptadecagonal) primes.at n=34A264824Prime numbersat n=40570