%I

%S 2,6,10,15,22,26,31,42,47,98,107,123,126,175,178,203,223,230,239,279,

%T 371,402,519,607,755,830,871,927,980,1527,1770,2007,2218,2247,2250,

%U 3982,4367,4510,9716,13018,20906,26340,40186,63332,84599,119743,156155

%N Numbers n such that 273*2^n-1 is prime.

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

%H Wilfrid Keller, <a href="http://www.prothsearch.net/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.htm">Riesel list k<300</a>.

%K hard,nonn

%O 1,1

%A _N. J. A. Sloane_, Dec 29 1999

%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008