The Card Number Validation hole will go live in . Why not try and solve it ahead of time?

StefanTifrea

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11 / 108 Holes

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2 / 58 Langs

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7 / 75 Cheevos

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Abundant Numbers
678
Divisors
749
Evil Numbers
589
Fibonacci
830
Fizz Buzz
529
Leap Years
892 642
Niven Numbers
577
Odious Numbers
587
Ordinal Numbers
481
Pernicious Numbers
332
Prime Numbers
538