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%I #4 Mar 30 2012 18:50:59
%S 0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,2,2,3,4,5,5,5,5,6,6,7,7,7,7,7,8,9,
%T 9,9,9,10,11,12,12,13,13,14,14,15,15,15,15,16,17,18,18,18,19,20,21,22,
%U 22,22,22,23,24,24,25,26,26,27,28,29,29,29,29,30,30,31,31,32,32,33,33,34
%N Number of numbers not greater than n with exactly one prime gap in their factorization.
%C a(n) > a(n-1) iff A073490(n) = 1;
%C A137721(n) > a(n) for n < 134;
%C A137721(n) < a(n) for n > 140.
%H R. Zumkeller, <a href="/A137722/b137722.txt">Table of n, a(n) for n = 1..1000</a>
%Y Cf. A073493.
%K nonn
%O 1,14
%A _Reinhard Zumkeller_, Feb 09 2008
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