280871domain: NPropertiesPrimalityPrimeyesAppears in sequencesEigensequence of triangle A110616: a(n) = Sum_{k=0..n-1} A110616(n-1,k)*a(k) for n>0 with a(0)=1.at n=9A125277Number of 7-element subsets of [n] whose sum is a triangular number.at n=26A320853Prime numbersat n=24504