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Search: id:A161324
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| A161324 |
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Let b(n,k) = the kth binary digit (starting at k=1, reading right to left) in the base 2 representation of n. (So: n = sum{k>=0} b(k+1)*2^k.) A positive integer n is included in this sequence if and only if n = product{k>=1} k^b(n,k). |
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+0
1
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OFFSET
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1,2
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COMMENT
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Hans Havermann found term a(5). Jack Brennen says that there are no other terms < 2^32.
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EXAMPLE
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12 in binary is 1100. And 12 = 4^1 * 3^1 * 2^0 * 1^0. So, 12 is in the sequence.
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CROSSREFS
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Sequence in context: A126293 A007668 A089415 this_sequence A116534 A130533 A082722
Adjacent sequences: A161321 A161322 A161323 this_sequence A161325 A161326 A161327
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KEYWORD
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base,more,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 07 2009
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