120557domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 23.at n=29A031611Irregular primes with irregularity index four.at n=15A219332Prime Erdős-Woods numbers.at n=9A342310Prime numbersat n=11344