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@article{Nicely95,
	author={T. Nicely},
	title={Enumeration to $10^14$ of the twin primes and {B}run's constant},
	abstract={The count $\pi_2(x)$ of the number of twin prime pairs $\le x$, as well
		as the count $\pi(x)$ of the number of primes $\le x$, was tabulated by
		means of a computer search for values of $x$ up to $10^14$ , at intervals
		of $10^9$ . The floating point sum of the reciprocals was also calculated,
		resulting in an improved estimate for Brun's constant of $1.9021605778$,
		with a standard deviation of $2.1 \times 10^{-9}$ . An algorithm for estimating
		the standard deviation of such calculations is described. In the course
		of the computation a flaw was discovered in the hardware divider of the
		floating point unit of Intel Corporation's Pentium microprocessor.},
	journal={Virginia Journal of Science},
	volume= 46,
	year= 1995,
	pages={195--204},
	number= 3,
	mrnumber={97e:11014},
	annote={Available at \url{http://www.trnicely.net/index.html}}
}