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Numbers (M_k+2)/3 where M_k is a Mersenne prime > 6.
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%I #4 Apr 03 2023 10:36:10

%S 3,11,43,2731,43691,174763,715827883,768614336404564651,

%T 206323339880896712483187371,54086425609737787797192670096043,

%U 56713727820156410577229101238628035243

%N Numbers (M_k+2)/3 where M_k is a Mersenne prime > 6.

%C Many small values are prime; (M_89+2)/3 is the first composite.

%H C. K. Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/page.php?sort=NewMersenneConjecture">Bateman, Selfridge, Wagstaff; the New Mersenne Prime Conjecture</a>

%Y Cf. A000668.

%K nonn

%O 3,1

%A _Yasutoshi Kohmoto_, May 22 2005

%E Edited by _Don Reble_, May 23 2005