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A138336
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First occurrence of exactly n consecutive numbers after A138335(n) (A138335(n) excluded).
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9
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OFFSET
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1,1
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COMMENTS
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Such number digits after decimal point of number Pi where the approximation to the number Pi by a root of a polynomial of 2 degree does not improve the accuracy exactly n next digits.
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LINKS
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EXAMPLE
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a(1)=18 because 3.141592653589793238 (18 digits) is root of -3061495 + 674903*x + 95366*x^2 and 3.1415926535897932385 (19 digits) also is root of that same polynomial -3061495 + 674903*x + 95366*x^2.
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CROSSREFS
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KEYWORD
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nonn,base,less,uned
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AUTHOR
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EXTENSIONS
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There are comments in the entry for A138335 which may cast doubt on the validity of this and related sequences. - N. J. A. Sloane, Mar 19 2008
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STATUS
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approved
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