A329103 Numbers k such that both k^2 - 3 and 2^k - 3 are primes.

4, 10, 14, 20, 266, 452, 694

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