%I #23 Dec 20 2018 14:03:04
%S 2,4,16,32,34,36,52,56,82,88,96,146,268,284,404,856,1652,3254,3848,
%T 4364,5034,9666,11542,14068,18086,19634,21614,23032,45736,57676,62642,
%U 97288,111692,113488,133908,242514,502646,695576,814158,862436,1022634,1962288
%N Numbers k such that 175*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/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[1000], PrimeQ[175*2^# + 1] & ] (* _Robert Price_, Dec 18 2018 *)
%o (PARI) is(n)=ispseudoprime(175*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn,hard
%O 1,1
%A _N. J. A. Sloane_.
%E a(33)-a(42) from the Ray Ballinger and Wilfrid Keller link by _Robert Price_, Dec 18 2018
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