1,1
Table of n, a(n) for n=1..4.
The chains in base ten for the first three terms are 2-->3, 7-->13-->37, and
181-->2521-->186733-->148988197.
Sequence in context: A077746 A159034 A120381 * A042359 A015174 A125610
Adjacent sequences: A173237 A173238 A173239 * A173241 A173242 A173243
base,nonn
James G. Merickel, Feb 13 2010
approved
