A050572 - OEIS

%I #18 Jan 17 2019 10:08:17

%S 3,4,7,10,15,18,19,24,27,39,60,84,111,171,192,222,639,954,2400,2587,

%T 4012,4359,5250,6012,6183,7344,10603,12403,13215,29154,78192,81294,

%U 103744,107991,174412,176479,203728,205158,251199,362268,580482

%N Numbers n such that 93*2^n-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>

%H Kosmaj, <a href="http://www.15k.org/riesellist.html">Riesel list k<300</a>.

%o (PARI) is(n)=ispseudoprime(93*2^n-1) \\ _Charles R Greathouse IV_, Jun 13 2017

%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