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A329103
Numbers k such that both k^2 - 3 and 2^k - 3 are primes.
1
4, 10, 14, 20, 266, 452, 694
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OFFSET
1,1
COMMENTS
a(8) > 2086750, using
A050414
. -
Michael S. Branicky
, Feb 16 2024
LINKS
Table of n, a(n) for n=1..7.
PROG
(PARI) isok(k) = isprime(k^2 - 3) && isprime(2^k - 3); \\
Michel Marcus
, Jul 02 2021
CROSSREFS
Intersection of
A050414
and
A028873
.
Cf.
A000040
,
A329102
.
Sequence in context:
A310423
A114335
A302087
*
A099355
A161366
A310424
Adjacent sequences:
A329100
A329101
A329102
*
A329104
A329105
A329106
KEYWORD
nonn
,
hard
,
more
AUTHOR
Alex Ratushnyak
, Nov 04 2019
STATUS
approved
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Last modified August 21 21:14 EDT 2024. Contains 375353 sequences. (Running on oeis4.)