100

This number is a composite.

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

The number of steps to reach 1 from 100 in the Collatz trajectory equals the number of primes less than or equal to 100, or π(100). The sequence of these numbers begin 1, 2, 4, 81, 98, 99, 100, ... . What's the largest example you can find? [Honaker]

π(100) = sum of all odd digits. [Honaker]