The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?

rotemkm

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23 / 126 Holes

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1 / 64 Langs

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13 / 109 Cheevos

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14 Feb 2026

Abundant Numbers

2,069^th

Arithmetic Numbers

780^th

Christmas Trees

1,429^th

Collatz

1,169^th

Divisors

3,865^th

Emirp Numbers

1,494^th

Emirp Numbers (Long)

718^th

Evil Numbers

1,014^th

Evil Numbers (Long)

800^th

Fibonacci

1,269^th

Fizz Buzz

780^th

Foo Fizz Buzz Bar

9^th

Kaprekar Numbers

871^st

Niven Numbers

2,525^th

Niven Numbers (Long)

1,364^th

Odious Numbers

1,000^th

Odious Numbers (Long)

753^rd

PalindromemordnilaP

391^st

Pernicious Numbers

1,506^th

Pernicious Numbers (Long)

658^th

Prime Numbers

2,703^rd

Prime Numbers (Long)

1,664^th

Tongue-twisters

2,034^th