10000000012
domain: N
Appears in sequences
- Smallest 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=30A077187
- a(n) = the smallest n-digit number with exactly 12 divisors, a(n) = 0 if no such number exists.at n=10A182683