The 8th test case is correct and can be solved within Cody's time limit. Why is it not being used? Up to 200.000, there are 20 amicable pairs.
For instance 176272,180848 is the 20th pair. For 3e5 my code can't go fast enough for Cody (45s), but I've found just 2 additional pairs 196724, 202444 and 185368, 203432.
Summing Digits within Text
Find number of days
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Linear system solve
Determine if input is a Narcissistic number
find subscripts from linear index
Sum! Sum! Sum!
Abelian Sandpile - 01
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