Prime Curios!: 239

239
(another Prime Pages' Curiosity)

Curios:

Curios Search:
Participate:

Single Curio View: (Seek other curios for this number)

In 1706, Machin discovered that

/4 = 4 arctan(1/5) - arctan(1/239). Shanks used this to calculate

to 707 places in 1873, but only the first 527 digits were correct.

Submitted: 1999-09-02 18:40:00; Last Modified: 2008-12-07 20:33:26.