OFFSET
1,1
COMMENTS
A curiosity perhaps worth mentioning is that the decimal representations of the 1st, 3rd and 4th primes generated in this process from a(5) all share the same initial two and final two digits (leading with 10 and ending with 81).
EXAMPLE
The chains in base ten for the first three terms are 2-->3, 7-->13-->37, and
181-->2521-->186733-->148988197.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
James G. Merickel, Feb 13 2010
EXTENSIONS
a(5) added by James G. Merickel, Jul 11 2013
STATUS
approved