12631111domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrime numbers P such that Q=24*P^3-1 is prime, R=24*Q^3-1 is prime and S=24*R^3-1 is also prime.at n=29A245681Number of Dyck paths of semilength n with distinct peak heights.at n=20A281874Prime numbersat n=826728