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

1,887^th

Arithmetic Numbers

1,079^th

Christmas Trees

1,678^th

Collatz

1,635^th

Divisors

3,981^st

Emirp Numbers

1,555^th

Emirp Numbers (Long)

858^th

Evil Numbers

932^nd

Evil Numbers (Long)

770^th

Fibonacci

1,212^th

Fizz Buzz

2,307^th

Foo Fizz Buzz Bar

1,093^rd

Kaprekar Numbers

925^th

Niven Numbers

2,466^th

Niven Numbers (Long)

1,334^th

Odious Numbers

895^th

Odious Numbers (Long)

748^th

PalindromemordnilaP

544^th

Pernicious Numbers

1,490^th

Pernicious Numbers (Long)

680^th

Prime Numbers

2,575^th

Prime Numbers (Long)

1,675^th

Tongue-twisters

2,135^th