it is not easy to reduce the scale of code like this. something in this solution is quite inspiring. THX.
Formatting currency numbers
Sum of first n terms of a harmonic progression
How long is the longest prime diagonal?
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Scrabble Scores - 4
Divisible by 6
Scrabble Scores - 6
Lights Out 13 - 5x5, three stages, x moves
Divisible by 15
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