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A050545 Numbers n such that 39*2^n-1 is a prime. 0

%I #19 Jan 17 2019 10:08:17

%S 3,24,105,153,188,605,795,813,839,2135,2619,4053,8333,15519,16025,

%T 16505,30684,40700,43683,52233,142205,222345,225333,292839,322613,

%U 747219,781220

%N Numbers n such that 39*2^n-1 is a 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 a prime</a>

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

%Y Cf. A002269 = 39*2^n+1 is a prime.

%K hard,nonn

%O 1,1

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

%E More terms from _Hugo Pfoertner_, Aug 29 2004

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

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)