19

This number is a prime.

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The largest prime on the Ishango bone. This tool (made from the fibula of a baboon) was found on the shore of Africa's Lake Edward and is believed to be at least 20000 years old. The numbers on one of its columns form a prime quadruple. It is now located on the 19th floor of the Royal Belgium Institute of Natural Sciences in Brussels.

Submitted: 1999-09-02 23:40:00; Last Modified: 2023-10-14 22:45:55.