Search: id:A066264
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%I A066264
%S A066264 0,0,0,5,141,2517,49835,1012858,24211837,721500293,22627459400,
%T A066264 844130935667,34729870646917
%N A066264 Number of composites < primorial(p) with all prime factors > p.
%C A066264 There is a simple relationship between this sequence and the number of 
               primes < primorial(p), as given by A000849 and sequence A005867 which 
               gives the number of composites in primorial(p+1) having (p+1) as 
               their lowest prime factor: a(n) = n + A005867(n+1) - A000849(n) - 
               1. - Dennis Martin (dennis.martin(AT)dptechnology.com), Apr 15 2007
%H A066264 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Primorial.html">Link to a section of The World of Mathematics.</a>
%e A066264 There are 5 composites < primorial(7) or 210 and whose prime factors 
               are all larger than 7: 121 (11*11), 143 (11*13), 169 (13*13), 187 
               (11*17) and 209 (11*19).
%Y A066264 Cf. A002110.
%Y A066264 Cf. A000849, A005867.
%Y A066264 Sequence in context: A061320 A136464 A006269 this_sequence A037049 A134503 
               A081322
%Y A066264 Adjacent sequences: A066261 A066262 A066263 this_sequence A066265 A066266 
               A066267
%K A066264 nonn
%O A066264 0,4
%A A066264 Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 10 2001.
%E A066264 More terms from Dennis Martin (dennis.martin(AT)dptechnology.com), Apr 
               15 2007

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