Search: id:A109029
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%I A109029
%S A109029 21168,23424,23616,27456,41184,42432,48114,61632,65472,86112,211410,
%T A109029 212256,213192,215232,217440,219072,230208,232512,236925,236928,238656,
%U A109029 238680,251100,251505,251748,253824,255024,255960,257856,259968,270912
%N A109029 9-almost primes (A046312) whose digit reversal is different and also 
               has 9 prime factors (with multiplicity). "Emirp Tsolma-9.".
%C A109029 This sequence is the k = 8 instance of the series which begins with k 
               = 1 (emirps), k = 2 (emirpimes), k = 3 (emirp tsolma-3 = A109023), 
               k = 4 (emirp tsolma-4 = A109024), k = 5 (emirp tsolma-5 = A109025), 
               k = 6 (emirp tsolma-6 = A109026), k = 7 (emirp tsolma-7 = A109027), 
               k = 8 (emirp tsolma-8 = A109028).
%C A109029 The Mathematica code for this was written by Ray Chandler who extended 
               this sequence. He also has more values.
%D A109029 Jonathan Vos Post, "1066 and All That: Emirp Tsolma-3 and Related Integer 
               Sequences." Forthcoming paper on this sequence.
%H A109029 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               AlmostPrime.html">Almost Prime</a>.
%H A109029 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Emirp.html">Emirp</a>.
%H A109029 Eric Weisstein and Jonathan Vos Post, <a href="http://mathworld.wolfram.com/
               Emirpimes.html">Emirpimes.</a>
%e A109029 a(1) = 21168 is in this sequence because 21168 = 2^4 * 3^3 * 7^2 is a 
               9-almost prime and reverse(21168) = 86112 = 2^5 * 3^2 * 13 * 23 is 
               also a 9-almost prime.
%Y A109029 Cf. A046312, A006567, A097393, A109018, A109023-A109028, A109030-A109131.
%Y A109029 Sequence in context: A043654 A157083 A097239 this_sequence A083361 A086477 
               A096554
%Y A109029 Adjacent sequences: A109026 A109027 A109028 this_sequence A109030 A109031 
               A109032
%K A109029 nonn,base
%O A109029 1,1
%A A109029 Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 16 2005

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