NerdyAarakocra

Fifteen is Seven. Seven is Five. Five is Four. Four is cosmic.

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Four is the "Cosmic Number," as it is the only number which has a letter count equal to its value. Because of this, if you take a number, count its letters, and repeat, you will eventually get to four, the only Cosmic Number.

That is, if you don't count like a deranged mathematician tormented by the Number Devil.

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The following numbers have all been found by myself and my cousin to be able to be expressed in some manner as to be Cosmic Numbers (I loved typing that). Try to figure out how to make each of them Cosmic. They're arranged from easiest to hardest. Bonus points if you find a new Cosmic Number.

4

15

17

16 (and it's not by going through some Cosmere rabbit hole, nice try though)

8

20

30

21

29

37

201

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Happy hunting!