A159262 - OEIS

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A159262

Largest prime appearing as an exponent in the sum in A159261.

%I #2 Mar 30 2012 17:22:54

%S 2,3,7,11,19,191,709,1597,16421

%N Largest prime appearing as an exponent in the sum in A159261.

%t s=1; Reap[Do[s=s+2^Prime[n]; If[PrimeQ[s], Sow[Prime[n]]], {n,2000}]][[2,1]]

%K nonn

%O 1,1

%A _T. D. Noe_, Apr 07 2009