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%I #4 Jul 14 2012 11:32:19
%S 1,2,4,5,10,16,28,47,83,147,267,481,882,1621,2997,5578,10428,19560,
%T 36849,69649,131983,250841,477992,912662,1746404,3347928,6429526,
%U 12366247,23820901,45947255
%N Numbers such that all subsets of {prime(a(1)),...,prime(a(n))} have a different sum.
%C see A138000,A138857,A138858.
%F A138856(n)=primepi(A138000(n))
%o (PARI) {s=1;p=0; for( n=1,20, until( !bitand( s, s>>prime(p++) ),); s+=s<<prime(p); print1( p,","))}
%Y Cf. A138000-138001, A138857-A138858, A064934.
%K nonn
%O 1,2
%A _M. F. Hasler_, Apr 10 2008
%E a(22)-a(30) from _Donovan Johnson_, Oct 03 2009
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