371321domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p divides the (right) concatenation of all numbers from 1 to p written in base 10 (most significant digit on left).at n=4A072712Numbers k such that the concatenation 1,2,3,...,(k-1) is divisible by k.at n=14A110740Prime numbersat n=31620