This repositiory is unfinished, I'll go back and add the rest of the files.
-DrawnSwords (moosebumps)
This repository is a collection of possible and approved permutations of 3 and 4 letter usernames that exist and will soon to exist on Roblox.
The files in this repository include letters A to Z, numbers 0 to 9, and underscore. There are two versions for each username length: Possible names, and allowed names.
There are 50,653 entries in this file with 198 KB worth of usernames. This may be a little bit slow to open, but it should be okay. But for slow computers open it in raw form.
With 1,874,161 combination entries, this monster of a file has about 17MB of potential and current usernames. You might need to download this file and open it in WordPad for it to open.
This video was very helpful on explaining Heap's Algorithm and how it is calculated in JavaScript. I used this Algorithm to help me calculate the Roblox usernames. Shoutout to Justin Kim for this video!
If you want to see if one of the usernames works, then I would suggest using NameChecker by daniel11420. It is Node.JS program that is available to dowload but is also available on repl.it and works rather well!
Here are the amount of permutations for each name length available when signing up for Roblox:
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3 letters - 50,653 permutations
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4 letters - 1,874,161 permutations
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5 letters - 69,343,957 permutations
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6 letters - 2.565726409e+9 permutations
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7 letters - 9.4931877133e+10 permutations
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8 letters - 3.5124794539e+12 permutations
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9 letters - 1.2996173979e+14 permutations
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10 letters - 4.8085843724e+15 permutations
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11 letters - 1.7791762177e+17 permutations
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12 letters - 6.5829520058e+18 permutations
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13 letters - 2.4356922421e+20 permutations
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14 letters - 9.0120612959e+21 permutations
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15 letters - 3.3344626795e+23 permutations
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16 letters - 1.2337511914e+25 permutations
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17 letters - 4.5648794082e+26 permutations
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18 letters - 1.6890053810e+28 permutations
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19 letters - 6.2493199099e+29 permutations
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20 letters- 2.3122483666e+31 permutations
lol Just imagine uploading over 23 nonillion entries worth of Roblox usernames... I sure can't.