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A370660
Numbers k such that (7^k + 7*k)/7 is prime.
2
1, 4, 36, 160, 342, 1086, 2094, 11524
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OFFSET
1,2
COMMENTS
If it exists, a(11) > 50000.
LINKS
Table of n, a(n) for n=1..8.
PROG
(PARI) is(n) = ispseudoprime(7^(n-1)+n)
CROSSREFS
Cf.
A221909
,
A226199
,
A370657
.
Cf.
A370190
,
A370661
.
Sequence in context:
A186434
A270989
A272557
*
A276295
A272146
A372218
Adjacent sequences:
A370657
A370658
A370659
*
A370661
A370662
A370663
KEYWORD
nonn
,
hard
,
more
AUTHOR
Hugo Pfoertner
, Feb 24 2024
STATUS
approved
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Last modified August 29 15:03 EDT 2024. Contains 375517 sequences. (Running on oeis4.)