A321356 Primes of the form 3*2^k - 25.

23, 71, 167, 359, 743, 1511, 12263, 24551, 196583, 393191, 786407, 6291431, 25165799, 1610612711, 6442450919, 25769803751, 103079215079, 206158430183, 6597069766631, 864691128455135207, 27670116110564327399, 221360928884514619367, 1770887431076116955111

Offset: 1

Author

Gilbert Mozzo, Nov 07 2018

Keywords

• nonn

Crossrefs

Cf. A050414, A321353 (k values).

Programs

Mathematica

Select[3*2^Range[4,100]-25 , PrimeQ] (* Amiram Eldar, Nov 15 2018 *)

PARI

for(n=0,20, if(ispseudoprime(p=3*2^n-25), print1(p, ", ")))

Extensions

More terms from Amiram Eldar, Nov 15 2018