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A138339
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Smallest index in A138343 which starts a plateau of n consecutive integers.
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9
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OFFSET
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1,2
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COMMENTS
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The sequence provides an indication of regions of nearly no improvements of the sequence of convergents to Pi when measured by the count of correct digits after rounding. A "plateau" of n consecutive integers is defined by a(n) = j such that A138343(j) = A138343(j+n-1) and such that none of the intermediate A138343 with index j+1 up to j+n-2 drop below this level.
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LINKS
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EXAMPLE
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a(3)=4 because the A138343(4) to A138343(6) are the earliest plateau of length 3.
The fact that there is a local maximum at A138343(5)=9 above the plateau is consistent with the definition.
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CROSSREFS
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KEYWORD
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nonn,less,base,bref
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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