Given a natural number reorder its digits to create another number, closest to the given one.
Make the vector [1 2 3 4 5 6 7 8 9 10]
Knight's Tour Checker
Add two numbers
subtract central cross
Is this triangle right-angled?
Alternative Scoring. Create an incremental spiral.
Optimum Egyptian Fractions
Pernicious Anniversary Problem
Open coded lock.
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