Search: id:A110607
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%I A110607
%S A110607 4,6,9,13,14,19,20,23,24,30,31,32,35,42,46,50,52,53,56,59,67,70,74,77,
%T A110607 78,79,87,91,95,98,100,101,102,111,112,118,119,120,122,123,131,134,136,
%U A110607 141,151,152,156,158,160,163,164,165,167,168,174,175,176,178,179,181
%N A110607 Numbers n whose base 9 representations, interpreted as base 10 integers, 
               are semiprimes.
%C A110607 A108873 is the equivalent using base 3. A110602 is the equivalent using 
               base 4. A110603 is the equivalent using base 5. A110604 is the equivalent 
               using base 6. A110605 is the equivalent using base 7. A110606 is 
               the equivalent using base 8.
%e A110607 a(1) = 4 because 4 (base 9) = 4 (base 10) = 2 * 2, a semiprime (A001358).
%e A110607 a(2) = 6 because 6 (base 9) = 6 (base 10) = 2 * 3.
%e A110607 a(3) = 9 because 9 (base 9) = 10 and 10 (base 10) = 2 * 5.
%e A110607 a(4) = 13 because 13 (base 9) = 14 and 14 (base 10) = 2 * 7.
%e A110607 a(5) = 14 because 14 (base 9) = 15 and 15 (base 10) = 3 * 5.
%t A110607 Select[Range[181], Plus @@ Last /@ FactorInteger[FromDigits[IntegerDigits[ 
               #, 9]]] == 2 &] (*Chandler*)
%Y A110607 Cf. A001358, A007095, A108873, A110602, A110603, A110604, A110605, A110607.
%Y A110607 Sequence in context: A078782 A165897 A020165 this_sequence A085802 A084916 
               A020747
%Y A110607 Adjacent sequences: A110604 A110605 A110606 this_sequence A110608 A110609 
               A110610
%K A110607 base,easy,nonn
%O A110607 1,1
%A A110607 Jonathan Vos Post (jvospost3(AT)gmail.com), Jul 30 2005
%E A110607 Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 05 2005

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