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Difficulty: 2 of 5 Latest: Factor hints II (in Numbers)
399337 = 6162 + 1412
399337 = 4642 + 4292

Based on the above results find the two prime factors of 399337.
(No Solution Yet, 0 Comments) Submitted on 2019-04-20 by Danish Ahmed Khan   
Difficulty: 3 of 5 Bonus: Stupid number trick III (in Numbers) Rating: 4.00
Pick any whole number greater than 1.

1. Write down all of its proper divisors (including 1 and the number itself)
2. Add the digits of these divisors.
3. Use this sum to repeat steps 1 and 2 until your number does not change.

Must the process terminate?
At what number(s) can the process terminate at?
What numbers <1000 take the most steps to terminate?

(Solution Posted, 11 Comments) Submitted on 2006-01-11 by Jer   
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