10000931domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the smallest n-digit prime p such that the concatenation a(1)a(2)...a(n-1)p is prime, with a(1) = 2.at n=7A049462Smallest n-digit base-10 deletable prime.at n=7A125589Prime numbersat n=664635