A379806 Numbers k such that 2^prime(k) - 3 is prime.

2, 3, 10, 51, 4462, 6883

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Formula

Apply PrimePi to A283266.

Example

Prime(3) = 5 and 2^5 - 3 = 29 is prime, so k = 3 is a member.

Prog

(PARI) isok(k) = ispseudoprime(1<<prime(k)-3); \\ Jinyuan Wang, Feb 09 2025

Crossrefs

Cf. A000720, A050414, A283266.

Sequence in context: A020098 A013081 A054921 * A192258 A052561 A181927

Adjacent sequences: A379803 A379804 A379805 * A379807 A379808 A379809

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 01 2025

Status

approved