179

This number is a prime.

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Between the beginning and the 179th digit of π, an equal number of five different decimal digits occur (there are 18 each of the digits 0, 3, 4, 5, and 9). Mike Keith conjectures this to be the last digit of π for which this happens (there are no others up to 10^9 digits).

Submitted: 2012-03-10 01:07:20; Last Modified: 2012-03-10 20:51:19.