73
This number is a prime.
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There are 73 pairs of consecutive primes whose products
have distinct digits. [Gaydos]
73 of the 216 possible rolls of three 6-sided dice total prime numbers. [Gaydos]
Removing the even digits from 2^73 leaves a prime number
(973957399739) with 73 embedded in it three times. [Gaydos]
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]
73 permutations of the digits 1234567 are prime numbers
that have prime twins. [Gaydos]
373 is probably the largest power of three that contains
exactly one zero. [Gaydos]