48404791domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the smallest prime whose base-b expansion, read as a base-10 number, is a prime for every b in 2, 3, ..., n. (For n > 10, each base-b expansion for 10 < b <= n must contain no digit larger than 9.)at n=5A316479Prime numbersat n=2910991