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A146754
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Numbers m with the property that shifting the rightmost digit of m to the left end multiplies the number by 5.
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7
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142857, 142857142857, 142857142857142857, 142857142857142857142857, 142857142857142857142857142857, 142857142857142857142857142857142857, 102040816326530612244897959183673469387755, 122448979591836734693877551020408163265306, 142857142857142857142857142857142857142857
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OFFSET
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1,1
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COMMENTS
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For k >= 1, (10^(6*k) - 1)/7 is a term.
For 5 <= a <= 9 and k >= 1, a*(10^(42*k) - 1)/49 is a term. (End)
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LINKS
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EXAMPLE
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b1 = 14285.
a(1) = b1*10 + 7,
5*a(1) = 714285 = 7*10^5 + b1.
b7 = 10204081632653061224489795918367346938775.
a(7) = b7*10 + 5,
5*a(7) = 510204081632653061224489795918367346938775 = 5*10^41 + b7. (End)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane, based on correspondence from William A. Hoffman III (whoff(AT)robill.com), Apr 10 2009
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STATUS
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approved
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