Search: id:A072746
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%I A072746
%S A072746 0,0,1,1,2,2,2,2,2,2,2,2,3,3,3,3,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,
%T A072746 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,
%U A072746 6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
%N A072746 Number of a pairs of primes (p, q) with p<q and (p+q)/2=2^(floor(Log2(q))+1).
%C A072746 As for counting twin primes the convention is followed that a prime pair 
               is <= n if its smaller member is <= n.
%Y A072746 Cf. A072742, A072743, A071538.
%Y A072746 Sequence in context: A054897 A003108 A111898 this_sequence A105390 A013941 
               A061798
%Y A072746 Adjacent sequences: A072743 A072744 A072745 this_sequence A072747 A072748 
               A072749
%K A072746 nonn
%O A072746 1,5
%A A072746 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 08 2002

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