OFFSET
1,1
COMMENTS
This is the best approximation to Pi using four square roots (with coefficients +/-1) of n < 200000, see also A087477.
EXAMPLE
3.14159265183290...
MATHEMATICA
RealDigits[N[(Sqrt[20467] - Sqrt[19578] + Sqrt[10177] - Sqrt[9553])/2, 101]] (* Georg Fischer, Apr 03 2020 *)
CROSSREFS
KEYWORD
AUTHOR
Zak Seidov, Sep 09 2003
EXTENSIONS
a(100) corrected by Georg Fischer, Apr 03 2020
STATUS
approved