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A071789
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Decimal expansion of the first (of 10) decimal selvage numbers; the n-th digit of a decimal selvage number, x, is equal to the tens digit of n*x.
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6
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1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 0, 2, 3, 4, 5, 7, 8, 9, 0, 2, 3, 4, 5, 7, 8, 9, 0, 1, 3, 4, 5, 6, 8, 9, 0, 1, 3, 4, 5, 6, 8, 9, 0, 1, 2, 4, 5, 6, 7, 9, 0, 1, 2, 4, 5, 6, 7, 9, 0, 1, 2, 3, 5, 6, 7, 8, 0, 1, 2, 3, 5, 6, 7, 8, 0, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 0, 2, 3
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| The selvage number, x = sum{k=1..inf} a(k)/10^k, is a normal number, but it is not known whether or not x is irrational. Is this sequence periodic?
Normal numbers are always irrational. [From Charles R Greathouse IV, Nov 12 2010]
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FORMULA
| a(n) = floor[10*(n*x)] (Mod 10), where x = sum{k=1..inf} a(k)/10^k.
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EXAMPLE
| a(7) = 8 since floor(10*(7*x)) = 8, x=.12346789123467890234578902345789013456890134568901...
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CROSSREFS
| Sequence in context: A172312 A086163 A175059 * A131870 A004724 A099260
Adjacent sequences: A071786 A071787 A071788 * A071790 A071791 A071792
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KEYWORD
| nonn,cons,base,nice
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Jun 06 2002
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