6197753domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = (natural numbers >= 3), t = A023531.at n=28A024313Prime numbersat n=425491