%I A002242 M0502 N0181
%S A002242 1,2,3,4,5,6,8,9,14,15,16,22,28,29,36,37,54,59,85,93,117,119,161,189,
%T A002242 193,256,308,322,327,411,466,577,591,902,928,946,1162,1428,1708,1724,
%U A002242 2063,2922,2951,3111,3402,4024,4485,5859,6124,8981,10628,19283,23522,26591,
               28914,33954,34743,76367,103546,103912,104452,125132,139883,174102,
               249065,306394,368553,528245,645542,818648
%N A002242 Numbers n such that 45*2^n-1 is prime.
%D A002242 H. Riesel, Lucasian criteria for the primality of N=h.2^n-1, Math. Comp., 
               23 (1969), 869-875.
%D A002242 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002242 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002242 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 A002242 Wilfrid Keller, <a href="http://www.prothsearch.net/riesel2.html">List 
               of primes k.2^n - 1 for k < 300</a>
%H A002242 <a href="Sindx_Pri.html#riesel">Index entries for sequences of n such 
               that k*2^n-1 (or k*2^n+1) is prime</a>
%H A002242 Kosmaj, <a href="http://www.15k.org/riesellist.htm">Riesel list k<300</
               a>.
%o A002242 (PARI) v=[ ]; for(n=1,2000, if(isprime(45*2^n-1),v=concat(v,n),)); v
%Y A002242 Sequence in context: A129525 A084693 A121644 this_sequence A039125 A038101 
               A073956
%Y A002242 Adjacent sequences: A002239 A002240 A002241 this_sequence A002243 A002244 
               A002245
%K A002242 hard,nonn
%O A002242 1,2
%A A002242 N. J. A. Sloane (njas(AT)research.att.com).
%E A002242 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008