73

This number is a prime.

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73 is the highest prime factor for 4273 of the first million composite numbers. 83 takes second place, being the highest prime factor for 4213 of the first million. 79 is third at 4211. [Gaydos]

Submitted: 2018-04-30 00:57:04; Last Modified: 2018-04-30 10:48:07.