549334763domain: NPropertiesPrimalityPrimeyesAppears in sequencesTriangle read by rows: row n lists prime factors of (p^p-1)/(p-1) where p = prime(n).at n=25A214811Largest prime factor of (p^p-1)/(p-1) where p = prime(n).at n=9A214812Prime numbersat n=28812216