932761domain: NPropertiesPrimalityPrimeyesAppears in sequencesTriangle V, read by rows, where column k of V^(j+1) = column j of P^(3k+2), for j>=0, k>=0 and where P=A136220.at n=29A136230Number of nonisomorphic open quipus with n nodes.at n=25A363251Prime numbersat n=73669