100

This number is a composite.

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

Submitted: 2018-09-29 00:29:53; Last Modified: 2018-09-29 00:32:33.