Derive Excel Column Letter from Column Number

[Carluccio555]

Hoping there is a simple-ish formula expression to accomplish this eg, if the input is '26' the output is 'Z' if the input is '52' the output  is 'ZZ'

Thanks

[ChrisTX]

Small correction to the helpful workflow from @AndrewDMerrill 

In the Generate Rows tool:
  original Loop Expression:        Floor((PreModulus)/26,1)
  corrected Loop Expression:   Floor((PreModulus)/26.001,1)

Column number	Manually verified Column Name	incorrect Column Name from original code
52	AZ	BZ
78	BZ	CZ
702	ZZ	AAZ

[AndrewDMerrill]

Good catch, @ChrisTX !

Unfortunately, I think the "corrected loop expression" will provide incorrect results for absurdly large values (>26000). That being said, thanks to your insights, I was able to finally see clearly what I struggled for so long to see. I have updated the math so that the outputs match what you and now I have manually verified to be correct. This new workflow should work for every input value you can feasibly throw at it.