198A.D.
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Archimedes (287-212 BC)
Archimedes
762 is when the decimal of pi had the earliest occurrence of the string 999999. Pi has been represented by a Greek letter since the mid 19th century.
If the diameter of a circle is 1 then its circumference is pi. The value of pi 3.1415926535897932384626433832795028841971693993751058209749445 923078164062862089986280348253421170679821480865132823066470938.... The earliest evidenced conscious use of an accurate approximation for the length of a circumference with respect to its radius is of 3+1/7th in the designs of the Old Kingdom pyramids in Egypt. Until the second millennium, it was known to fewer than 10 decimal digits.
The longest known value of pi is now into the hundreds of billions of digits.