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%I #30 Sep 08 2022 08:45:00
%S 30,264,486,1950,3480,14106,77394,472530,1494614,2868750
%N Numbers k such that 283*2^k + 1 is prime.
%H Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/riesel1.html">List of primes k.2^n + 1 for k < 300</a>
%H Wilfrid Keller, <a href="http://www.prothsearch.com/riesel2.html">List of primes k.2^n - 1 for k < 300</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[5*10^3], PrimeQ[283*2^# + 1] &] (* _G. C. Greubel_, May 24 2018 *)
%o (PARI) is(n)=ispseudoprime(283*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017
%o (Magma) [n: n in [1..5000] | IsPrime(283*2^n+1)]; // _G. C. Greubel_, May 24 2018
%K hard,nonn,more
%O 1,1
%A _N. J. A. Sloane_, Dec 29 1999
%E a(8)-a(9) from the Ray Ballinger and Wilfrid Keller link by _Robert Price_, Dec 20 2018
%E a(10) from _Jeppe Stig Nielsen_, Jan 19 2020
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