1000062domain: NAppears in sequencesSmallest k such that the concatenation 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1) is a multiple of prime(n), or 0 if no such number exists.at n=37A077187Least multiple of n in which the n-th digit from left is 2.at n=6A113557