Search: id:A063644
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%I A063644
%S A063644 19,29,43,67,173,283,317,653,787,907,1867,2083,2693,2803,3413,3643,
%T A063644 3677,4253,4363,4723,5443,5717,6197,6547,6653,8563,8573,9067,9187,9403,
%U A063644 9643,10733,11443,11587,12163,12917,13997,14107,14683,15187,17827
%N A063644 Primes with 2 representations: p*q*r - 1 = u*v*w + 1 where p, q, r, u, 
               v and w are primes.
%H A063644 Harry J. Smith, <a href="b063644.txt">Table of n, a(n) for n=1,...,1000</
               a>
%e A063644 A063644(20) = 4723: 4723 = A063639(168)= 4724 - 1 = 2*2*1181 - 1, 4723 
               = A063640(158)= 4722 + 1 = 2*3*787+ 1.
%o A063644 (PARI) { n=0; default(primelimit, 2000000); for (m=2, 10^9, p=prime(m); 
               if (bigomega(p + 1) == 3 && bigomega(p - 1) == 3, write("b063644.txt", 
               n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), 
               Aug 27 2009]
%Y A063644 A063639, A063640, A014612.
%Y A063644 Sequence in context: A096218 A100590 A046120 this_sequence A156782 A092600 
               A050266
%Y A063644 Adjacent sequences: A063641 A063642 A063643 this_sequence A063645 A063646 
               A063647
%K A063644 nonn
%O A063644 1,1
%A A063644 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 21 2001

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