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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
OFFSET
1,1
COMMENTS
a(8) > 2086750, using A050414. - Michael S. Branicky, Feb 16 2024
PROG
(PARI) isok(k) = isprime(k^2 - 3) && isprime(2^k - 3); \\ Michel Marcus, Jul 02 2021
CROSSREFS
Intersection of A050414 and A028873.
Sequence in context: A310423 A114335 A302087 * A099355 A161366 A310424
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, Nov 04 2019
STATUS
approved