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%I #6 Dec 19 2017 02:14:52
%S 1,1,2,2,2,3,4,3,5,5,6,6,7,7,7,9,10,9,9,10,12,13,14,12,14,14,14,15,15,
%T 15,17,18,20,19,19,20,18,20,21,23,24,23,25,26,25,26,27,28,29,29,28,29,
%U 29,31,30,31,33,33,33,33,32,34,37,38,38,38,40,40,40,41,42,42,42,43,43
%N Number of primes between prime(n)/sqrt(2) and prime(n)*sqrt(2).
%C a(n) = A000720(A001951(A000040(n))) - A000720(A049472(A000040(n))).
%K nonn
%O 1,3
%A _Reinhard Zumkeller_, Oct 01 2004
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