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A032465 Numbers n such that 177*2^n+1 is prime. 0


%S 2,4,6,12,16,20,23,32,38,48,54,60,100,116,118,119,140,150,163,170,190,

%T 244,271,294,299,320,334,414,439,442,468,724,794,842,864,1032,1750,

%U 2050,3980,4010,4756,5096,5963,5966,6836,14160,16748,16844,19814,25398

%N Numbers n such that 177*2^n+1 is prime.

%H Ray Ballinger, <a href="http://web.archive.org/web/20160604135248/http://www.prothsearch.net/index.html">Proth Search Page</a>

%H Ray Ballinger and Wilfrid Keller, <a href="http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html">List of primes k.2^n + 1 for k < 300</a>

%H Wilfrid Keller, <a href="http://web.archive.org/web/20161028021640/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>

%o (PARI) is(n)=ispseudoprime(177*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%K nonn,hard

%O 1,1

%A _N. J. A. Sloane_.

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Last modified July 22 18:10 EDT 2017. Contains 289671 sequences.