146077domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of compositions of n with all adjacent parts (x,y) satisfying x < 2y and y < 2x.at n=36A342330Smallest prime p == 5 (mod 8) such that Q(sqrt(p)) has class number 2n+1.at n=15A355877Smallest p == 1 (mod 4) such that Q(sqrt(p)) has class number 2n+1.at n=15A355878Prime numbersat n=13517