Search: id:A143205
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%I A143205
%S A143205 55,91,187,247,275,391,605,637,667,1147,1183,1375,1591,1927,2057,2491,
%T A143205 3025,3127,3179,3211,4087,4459,4693,4891,5767,6647,6655,6875,7387,8281,
%U A143205 8993,9991,10807,11227,12091,15125,15341,15379,17947,19343,22627,23707
%N A143205 Numbers having exactly two distinct prime factors p, q with q=p+6.
%C A143205 A143201(a(n)) = 7;
%C A143205 A020639(a(n))in A023201 and A006530(a(n)) in A046117;
%C A143205 subsequence of A007774: A001221(a(n))=2; A111192 is a
%C A143205 subsequence.
%H A143205 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               SexyPrimes.html">Sexy Primes</a>
%H A143205 <a href="Sindx_Pri.html#gaps">Index entries for primes, gaps between</
               a>
%e A143205 a(1) = 55 = 5 * 11 = A023201(1) * A046117(1);
%e A143205 a(2) = 91 = 7 * 13 = A023201(2) * A046117(2);
%e A143205 a(3) = 187 = 11 * 17 = A023201(3) * A046117(3);
%e A143205 a(4) = 247 = 13 * 19 = A023201(4) * A046117(4);
%e A143205 a(5) = 275 = 5^2 * 11 = A023201(1)^2 * A046117(1);
%e A143205 a(6) = 391 = 17 * 23 = A023201(5) * A046117(5);
%e A143205 a(7) = 605 = 5 * 11^2 = A023201(1) * A046117(1)^2;
%e A143205 a(8) = 637 = 7^2 * 13 = A023201(2)^2 * A046117(2);
%e A143205 a(9) = 667 = 23 * 29 = A023201(6) * A046117(6);
%e A143205 a(10) = 1147 = 31 * 37 = A023201(7) * A046117(7).
%Y A143205 Sequence in context: A039533 A157484 A027865 this_sequence A111192 A063873 
               A063131
%Y A143205 Adjacent sequences: A143202 A143203 A143204 this_sequence A143206 A143207 
               A143208
%K A143205 nonn
%O A143205 1,1
%A A143205 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 30 2008

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