73

This number is a prime.

Just showing those entries submitted by 'Robinette': (Click here to show all)

+ The clepsydra (an ancient device that measured time by marking the regulated flow of water through a small opening) had a wheel with 73 teeth. [Robinette]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell