Skewes number

Skewes number

[′skyüz ‚nəm·bər]
(mathematics)
The first integer n for which the number of primes not greater than n is greater than the Cauchy principal value of the integral over x from 0 to n of the reciprocal of the natural logarithm of x.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.