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A115589
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Multiply first digit by k, append result to sequence; multiply 2nd digit by k, append result to sequence; multiply 3rd digit by k, append result to sequence, etc. a(1)=1, k=7 case.
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0
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1, 7, 49, 28, 63, 14, 56, 42, 21, 7, 28, 35, 42, 28, 14, 14, 7, 49, 14, 56, 21, 35, 28, 14, 14, 56, 7, 28, 7, 28, 49, 28, 63, 7, 28, 35, 42, 14, 7, 21, 35, 14, 56, 7, 28, 7, 28, 35, 42, 49, 14, 56, 49, 14, 56, 28, 63, 14, 56, 42, 21, 49, 14, 56, 21, 35, 28, 14, 7, 28, 49, 14, 7, 21
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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All terms are evidently multiplies of 7: 7,14,...,63. Is sequence periodic? Some repeating patterns are obvious, e.g., 63,7,28,35,42, but no cycle appears.
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LINKS
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Table of n, a(n) for n=1..74.
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MATHEMATICA
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ss=s={1}; Do[d=7s[[i]]; AppendTo[ss, d]; s=Flatten[{s, IntegerDigits[d]}], {i, 200}]; ss
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CROSSREFS
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Cf. A115425.
Sequence in context: A024092 A163713 A192897 * A014390 A043070 A083930
Adjacent sequences: A115586 A115587 A115588 * A115590 A115591 A115592
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov, Mar 09 2006
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STATUS
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approved
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