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A138336 First occurrence of exactly n consecutive numbers after A138335(n) (A138335(n) excluded). 9
18, 27, 127, 1111 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
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.
LINKS
EXAMPLE
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.
CROSSREFS
Sequence in context: A337752 A279108 A038632 * A349485 A166630 A154920
KEYWORD
nonn,base,less,uned
AUTHOR
Artur Jasinski, Mar 15 2008
EXTENSIONS
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
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)