174259domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of pairs (lambda,mu) of partitions lambda of n and mu of nine with mu <= lambda (by diagram containment).at n=22A303859Primes of the form (p^2 - p*q + q^2)/3, where p and q are consecutive primes.at n=20A342706Prime numbersat n=15856