A321356 - OEIS

%I #26 Jan 10 2019 23:24:25

%S 23,71,167,359,743,1511,12263,24551,196583,393191,786407,6291431,

%T 25165799,1610612711,6442450919,25769803751,103079215079,206158430183,

%U 6597069766631,864691128455135207,27670116110564327399,221360928884514619367,1770887431076116955111

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

%t Select[3*2^Range[4,100]-25 , PrimeQ] (* _Amiram Eldar_, Nov 15 2018 *)

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

%Y Cf. A050414, A321353 (k values).

%K nonn

%O 1,1

%A _Gilbert Mozzo_, Nov 07 2018

%E More terms from _Amiram Eldar_, Nov 15 2018