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A171247
Numbers n such that 1+20^n+200^n is prime.
0
0, 19, 59, 291, 327, 3951
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OFFSET
0,2
COMMENTS
No more terms up to n=6900.
LINKS
Table of n, a(n) for n=0..5.
PROG
(PARI) is(n)=ispseudoprime(1+20^n+200^n) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A236462
A139981
A235705
*
A270818
A206426
A211145
Adjacent sequences:
A171244
A171245
A171246
*
A171248
A171249
A171250
KEYWORD
nonn
AUTHOR
Jason Earls
, Dec 06 2009
STATUS
approved
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Last modified March 29 08:01 EDT 2024. Contains 371265 sequences. (Running on oeis4.)