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The No "O" challenge

3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, 27, 28, 29, and 30 all have something similar, but I can't really think regarding what it actually is...

3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, 27, 28, 29, and 30 all have something similar, but I can't really think regarding what it actually is...

@PenguinWhack271828e said in #23:

3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, 27, 28, 29, and 30 all have something similar, but I can't really think regarding what it actually is...
They are all Numbers!

@PenguinWhack271828e said in #23: > 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, 27, 28, 29, and 30 all have something similar, but I can't really think regarding what it actually is... They are all [Numbers!](https://0.tqn.com/z/g/math/library/100.pdf)

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