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A050524 Primes of the form 9*2^n-1. 3

%I #12 Oct 01 2021 17:43:55

%S 17,71,1151,73727,294911,18874367,79164837199871,83010348331692982271,

%T 5704427701027032306735164424191,5841333965851681082096808370372607,

%U 6576757367989063131916581747223273588451696443391

%N Primes of the form 9*2^n-1.

%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>

%t Select[9 2^Range[0,160]-1,PrimeQ] (* _Harvey P. Dale_, Apr 13 2011 *)

%Y See A002236 for more terms.

%K nonn,nice

%O 1,1

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

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Last modified July 16 08:10 EDT 2024. Contains 374345 sequences. (Running on oeis4.)