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A108468
Numbers k such that (1/9)*(-1 + 10^k) + k is prime.
0
1, 2, 8, 10, 20, 590, 1058
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OFFSET
1,2
COMMENTS
Some of the larger entries may only correspond to probable primes.
a(8) > 6000. -
Tyler NeSmith
, May 09 2021
LINKS
Table of n, a(n) for n=1..7.
PROG
(PARI) is(n)=ispseudoprime((10^n-1)/9+n) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A110369
.
Sequence in context:
A032356
A114272
A193266
*
A165593
A127219
A122208
Adjacent sequences:
A108465
A108466
A108467
*
A108469
A108470
A108471
KEYWORD
more
,
nonn
AUTHOR
Jason Earls
, Jul 25 2005
STATUS
approved
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Last modified April 25 08:25 EDT 2024. Contains 371964 sequences. (Running on oeis4.)