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Numbers k such that 33*2^k - 1 is prime.
(Formerly M0752 N0284)
3

%I M0752 N0284 #28 Dec 20 2021 20:59:26

%S 2,3,6,8,10,22,35,42,43,46,56,91,102,106,142,190,208,266,330,360,382,

%T 462,503,815,1038,1651,1855,1858,1992,2232,4462,4726,5475,6702,9710,

%U 10931,11503,20552,22291,26575,35931,39271,51326,57695,63115,67182,109848,128635,136971,173110,174182,373446,585400,598248,674050,773030

%N Numbers k such that 33*2^k - 1 is prime.

%D H. Riesel, Lucasian criteria for the primality of N=h.2^n-1, Math. Comp., 23 (1969), 869-875.

%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%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(33*2^n-1) \\ _Charles R Greathouse IV_, May 22 2017

%K hard,nonn

%O 1,1

%A _N. J. A. Sloane_

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