55639domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of symmetric ways of folding a strip of n labeled stamps.at n=11A000560Primes p such that the left prime neighbors p1, p2 of p as well as the right prime neighbors q1, q2 of p form twin prime pairs and the sum p1 + p2 + p + q1 + q2 is also prime.at n=31A138396Prime numbersat n=5646