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.
Convert from Base 10 to base 5
Set some matrix elements to zero
Connect Four - 02
Sub-sequence - 02
Ugly numbers - 02
find subscripts from linear index
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