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A224507
Numbers n such that (17^n + 2^n)/19 is prime.
2
5, 7, 113, 193, 211, 701, 797, 907, 4153
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OFFSET
1,1
COMMENTS
All terms are prime.
a(10) > 10^5.
LINKS
Table of n, a(n) for n=1..9.
MATHEMATICA
Select[Prime[Range[1, 100000]], PrimeQ[(17^# + 2^#)/19]&]
PROG
(PARI) is(n)=ispseudoprime((17^n+2^n)/19) \\
Charles R Greathouse IV
, Jun 06 2017
CROSSREFS
Cf.
A057183
,
A125957
,
A222265
,
A225191
,
A227046
.
Sequence in context:
A259496
A338525
A267586
*
A065927
A217726
A016054
Adjacent sequences:
A224504
A224505
A224506
*
A224508
A224509
A224510
KEYWORD
nonn
,
hard
,
more
AUTHOR
Robert Price
, Jul 20 2013
STATUS
approved
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Last modified August 18 19:26 EDT 2024. Contains 375273 sequences. (Running on oeis4.)