A089919 Numbers k such that 3^prime(k) - 2 is prime.

1, 3, 12, 13, 66, 100, 369

Offset: 1

Author

Cino Hilliard, Jan 11 2004

Keywords

• nonn
• more

Comments

No additional terms up to n=1000. - Harvey P. Dale, Oct 10 2016

a(8) > 91500, if it exists (based on the data at A014224). - Amiram Eldar, Jul 07 2024

Crossrefs

Cf. A000720, A014224, A086218.

Programs

Mathematica

Select[Range[370],PrimeQ[3^Prime[#]-2]&] (* Harvey P. Dale, Oct 10 2016 *)

PARI

f(n) = for(x=1,n,if(ispseudoprime(3^prime(x)-2),print1(x,",")))

Formula

a(n) = A000720(A086218(n)). - Amiram Eldar, Jul 07 2024

Extensions

Definition corrected by Jorge Coveiro, Jan 31 2006, Jul 25 2006