Search: id:A123754
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%I A123754
%S A123754 3,63,99,195,255,399,483,575,675,783,1023,1155,1295,1443,1599,1935,2115,
%T A123754 2303,2499,2703,2915,3135,3363,3843,4095,4355,4623,4899,5475,5775,6083,
%U A123754 6399,6723,7055,7395,7743,8099,8463,8835,9215,9603,9999,10815
%N A123754 Positive numbers of the form 4*n^2-1 which are not semiprimes.
%C A123754 Positive numbers of the form 4*n^2-1 which are semiprimes can be found 
               in A037074.
%C A123754 Or, all positive products of the form A014076(i)*[A014076(i)+-2], duplicates 
               removed. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2007
%F A123754 ( A000466 MINUS {-1} ) MINUS A001358. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 08 2007
%t A123754 Select[4*(Range[54])^2-1, Not[PrimeQ[Sqrt[(#+ 1)]-1] && PrimeQ[Sqrt[(#+1)]+1]]&]
%Y A123754 Cf. A000466, A037074.
%Y A123754 Sequence in context: A144422 A135444 A087886 this_sequence A048354 A046181 
               A151993
%Y A123754 Adjacent sequences: A123751 A123752 A123753 this_sequence A123755 A123756 
               A123757
%K A123754 nonn
%O A123754 1,1
%A A123754 Roger Bagula (rlbagulatftn(AT)yahoo.com), Nov 16 2006
%E A123754 Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 03 2007

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