Table of n, a(n) for n=1..7.
The concatenations short of the one ending with 61 are not divisible by 13, while that one is.
Cf. A183194, A185656, and those following.
Sequence in context: A168023 A044312 A044693 * A140726 A051646 A142320
Adjacent sequences: A185659 A185660 A185661 * A185663 A185664 A185665
James G. Merickel, Feb 01 2011