OFFSET
0,1
LINKS
Daniel Suteu and Harry J. Smith, Table of n, a(n) for n = 0..172 (terms a(0)..a(50) from Harry J. Smith)
FORMULA
MATHEMATICA
Table[FactorInteger[9^(2n)+1][[-1, 1]], {n, 0, 20}] (* Harvey P. Dale, Jan 07 2013 *)
PROG
(PARI) a(n)={vecmax(factor(9^(2*n) + 1)[, 1])} \\ Harry J. Smith, Aug 20 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 12 2001
EXTENSIONS
Definition corrected by Harry J. Smith, Aug 20 2009
STATUS
approved