A383914 Primes p such that 12*2^p + 1 is also prime.

3, 199, 3187, 44683, 59971, 213319, 303091, 916771

Offset: 1

Author

Vincenzo Librandi, May 17 2025

Keywords

• nonn
• more

Comments

If k is a term in A002253 and k-2 is prime, then k-2 is a term. - Amiram Eldar, May 17 2025

Examples

			3 is a term because 12*2^3+1 = 97 (prime).
		

Crossrefs

Cf. A002253, A175172, A322301, A322302.

Programs

Magma

[p: p in PrimesUpTo (3500) | IsPrime(12*2^p+1)];

Mathematica

Select[Prime[Range[3500]],PrimeQ[12 2^#+1]&]

Extensions

a(4)-a(8) from the b-file at A002253 added by Amiram Eldar, May 17 2025