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%I #4 Dec 24 2016 14:25:50
%S 1,2,4,64,
%T 2085924839766513752338888384931203236916703635113918720651407820138886450957656787131798913024
%N a(1)=1, a(n+1)=2^(prime(a(n))-1).
%t NestList[Power[2,Prime[#]-1]&,1,4]
%Y Cf. A058891, A279944.
%K nonn
%O 1,2
%A _Gus Wiseman_, Dec 24 2016
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