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A323004 Numbers k such that 359*2^k+1 is prime. 0


%S 1,5,7,9,47,55,65,69,97,103,273,1231,1721,2277,3981,4125,4569,5135,

%T 8327,8593,24249,37609,396617,633247,920709,2165551,2870935

%N Numbers k such that 359*2^k+1 is prime.

%H Ray Ballinger, <a href="http://www.prothsearch.com/index.html">Proth Search Page</a>

%H Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/riesel1a.html">List of primes k.2^n + 1 for 300 < k < 600</a>

%H Y. Gallot, <a href="http://www.utm.edu/research/primes/programs/gallot/index.html">Proth.exe: Windows Program for Finding Large Primes</a>

%H Wilfrid Keller, <a href="http://www.prothsearch.com/riesel2.html">List of primes k.2^n - 1 for k < 300</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ProthPrime.html">Proth Prime</a>

%H <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>

%t Select[Range[1000], PrimeQ[359*2^# + 1] &] (* _Robert Price_, Jan 01 2019 *)

%K nonn,more,hard

%O 1,2

%A _Robert Price_, Jan 01 2019

%E a(26) from _Jeppe Stig Nielsen_, Apr 19 2020

%E a(27) from _Jeppe Stig Nielsen_, Aug 05 2020

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)