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A370663
Numbers k such that (9^k + 9*k)/9 is prime.
1
1, 2, 4, 8, 10, 28, 1348, 1424, 12838
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OFFSET
1,2
COMMENTS
If it exists, a(10) > 50000.
LINKS
Table of n, a(n) for n=1..9.
PROG
(PARI) is(n) = ispseudoprime(9^(n-1)+n)
CROSSREFS
Cf.
A221911
,
A226202
.
Sequence in context:
A124849
A056654
A365002
*
A020950
A056386
A331027
Adjacent sequences:
A370660
A370661
A370662
*
A370664
A370665
A370666
KEYWORD
nonn
,
hard
,
more
AUTHOR
Hugo Pfoertner
, Feb 27 2024
STATUS
approved
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Last modified August 12 04:04 EDT 2024. Contains 375085 sequences. (Running on oeis4.)