%I A002959 M0979
%S A002959 1,2,4,5,14,24,29,36,46,80,474,1018,5180
%N A002959 Numbers n such that 2*7^n - 1 is prime.
%D A002959 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002959 C. R. Zarnke and H. C. Williams, Computer determination of some large 
               primes, pp. 563-570 in Proceedings of the Louisiana Conference on 
               Combinatorics, Graph Theory and Computer Science. Vol. 2, edited 
               R. C. Mullin et al., 1971.
%t A002959 Do[ If[ PrimeQ[ 2*7^n - 1 ], Print[n] ], {n, 1, 10000} ]
%Y A002959 Sequence in context: A000063 A039574 A121410 this_sequence A071316 A056401 
               A056406
%Y A002959 Adjacent sequences: A002956 A002957 A002958 this_sequence A002960 A002961 
               A002962
%K A002959 nonn,hard
%O A002959 1,2
%A A002959 N. J. A. Sloane (njas(AT)research.att.com).
%E A002959 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 05 2001