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%I #21 Jan 17 2019 10:08:17
%S 1,3,5,6,18,19,20,22,28,29,39,43,49,75,85,92,111,126,136,159,162,237,
%T 349,381,767,969,1247,1893,1951,2363,2657,3065,3090,3836,4110,4342,
%U 5671,6807,21945,24658,30082,31811,54510,70828,79292,80938,84432,92235,113429
%N Numbers k such that 75*2^k-1 is prime.
%H Robert Price, <a href="/A050563/b050563.txt">Table of n, a(n) for n = 1..60</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>
%H Kosmaj, <a href="http://www.15k.org/riesellist.html">Riesel list k<300</a>.
%t Select[Range[1000], PrimeQ[75*2^# - 1] & ] (* _Robert Price_, Dec 22 2018 *)
%o (PARI) is(n)=ispseudoprime(75*2^n-1) \\ _Charles R Greathouse IV_, Jun 13 2017
%K hard,nonn
%O 1,2
%A _N. J. A. Sloane_, Dec 29 1999
%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
%E a(58)-a(60) from the Wilfrid Keller link by _Robert Price_, Dec 22 2018
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