a

_{n}= sum of all factors of a

_{n-1}, excluding a

_{n-1}itself. Most sequences either converge or begin to repeat.

S(12) → 12,16,15,9,4,3,1,1,1...

S(6) → 6,6,6,6,...

S(220) → 220,284,220,284,220,284,...

Try to evaluate S(50), S(80), S(99).

How about S(138)?

**WILL IT CONVERGE TO 1,1,1,...?**

Please comment!