Definition:Brun's Constant/Mistake

Source Work

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary

$1 \cdotp 90216 \, 054 \ldots$

Mistake

Brun's constant ... Its value is exceedingly hard to calculate. The best estimate is $1 \cdotp 90195 \pm 10^{-5}$.

While this statement was correct at the time of the first $1986$ edition of David Wells: Curious and Interesting Numbers, by the time of the second edition, the number had been refined considerably, to $1 \cdotp 90216 \, 054 \ldots$.

Interestingly, David Wells had updated the title of the section, but not the detail inside it.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1 \cdotp 90216 \, 054 \ldots$