130139domain: NAppears in sequencesStrong Lucas pseudoprimes.at n=15A217255Number of length 5+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=19A248542Numbers n such that Sum_{q|n} 0.q is an integer where q ranges over the aliquot parts of n.at n=19A276699