

A119529


Numbers k such that Sum_{j=1..k1} j*2^(j1) is prime.


4



3, 4, 8, 28, 52, 56, 82, 1472, 1484, 8669, 10886, 20804, 32606, 36392, 57005, 61628
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS



MATHEMATICA

s = 0; Do[s += (x1)*2^(x1)/2; If[PrimeQ[s], Print[x]], {x, 10^4}] (* Ryan Propper, Jan 01 2007 *)


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



