OFFSET
1,2
COMMENTS
a(13) > 203597. - Ray Chandler, Apr 10 2016
REFERENCES
H. Dubner, Generalized Cullen numbers, J. Rec. Math., 21 (No. 3, 1989), 190-191.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
MATHEMATICA
k = 0; While[k < 10001, If[PrimeQ[k*18^k + 1], Print@ k]; k++] (* Robert G. Wilson v, Aug 19 2013 *)
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
Error in description corrected 8/97.
a(7) from Robert G. Wilson v, Dec 10 2012
a(8)-a(10) from Giovanni Resta, Aug 21 2013
a(11)-a(12) from Loeh link by Ray Chandler, Apr 10 2016
STATUS
approved