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

1,1

Links

Table of n, a(n) for n=1..23.

Mathematica

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

Prog

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

Crossrefs

Cf. A050414, A321353 (k values).

Sequence in context: A142405 A139962 A248877 * A139878 A035072 A201716

Adjacent sequences: A321353 A321354 A321355 * A321357 A321358 A321359

Keyword

nonn

Author

Gilbert Mozzo, Nov 07 2018

Extensions

More terms from Amiram Eldar, Nov 15 2018

Status

approved