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%I #4 Oct 19 2017 03:14:17
%S 1,3,5,11,23,47,751,6007,24029,192233,768931,98423167,206408341520383,
%T 54108708279519281153,907793486286483356068610047,
%U 58098783122334934788391043009
%N a(1) = 1; a(n+1) is the least prime of the form (2^k)*a(n)+-1, for some positive k.
%e a(7) = 751 because a(6)=47 and in 2*47-1, 2*47+1, 4*47-1, 4*47+1, ... 16*47-1, ...: 751 is the first prime.
%Y Cf. A083201.
%K nonn
%O 1,2
%A _Don Reble_, Jun 21 2003
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