198461domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of character table entries of the symmetric group S_n which are > 0.at n=20A051749Primes of the form (p*(q-1) + (p-1)*q)/2, where p and q are consecutive odd primes.at n=15A099911Irregular primes with irregularity index four.at n=29A219332Prime numbersat n=17860