Smallest multiple of prime(n) of the form 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1), or 0 if no such number exists.
A077186
Smallest multiple of prime(n) of the form 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1), or 0 if no such number exists.
Terms
- a(0) =0a(1) =12321a(2) =0a(3) =12345654321a(4) =121a(5) =12345654321
External references
- oeis: A077186