4888313domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = (1/2)*s(n+3), where s = A025251.at n=23A025252Diagonal sums of number triangle [k<=n]*C(n,2n-2k)2^(n-k)A000108(n-k).at n=24A160565Prime numbersat n=341197