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A071791
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Decimal expansion of the third (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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5
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2, 5, 7, 0, 2, 5, 7, 0, 3, 5, 8, 0, 3, 5, 8, 1, 3, 6, 8, 1, 3, 6, 9, 1, 4, 6, 9, 1, 4, 7, 9, 2, 4, 7, 9, 2, 5, 7, 0, 2, 5, 7, 0, 3, 5, 8, 0, 3, 5, 8, 1, 3, 6, 8, 1, 3, 6, 9, 1, 4, 6, 9, 1, 4, 7, 9, 2, 4, 7, 9, 2, 5, 7, 0, 2, 5, 7, 0, 3, 5, 8, 0, 3, 5, 8, 1, 3, 6, 8, 1, 3, 6, 9, 1, 4, 6, 9, 1, 4, 7
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OFFSET
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0,1
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COMMENTS
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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?
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LINKS
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Table of n, a(n) for n=0..99.
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FORMULA
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a(n) = floor[10*(n*x)] (Mod 10), where x = sum{k=1..inf} a(k)/10^k.
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EXAMPLE
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a(6) = 5 since floor(10*(6*x)) = 5, x=.25702570358035813681369146914792479257025703580358...
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CROSSREFS
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Sequence in context: A176007 A009376 A025123 * A021393 A181583 A010589
Adjacent sequences: A071788 A071789 A071790 * A071792 A071793 A071794
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KEYWORD
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nonn,cons,base,nice
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AUTHOR
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Paul D. Hanna, Jun 06 2002
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STATUS
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approved
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