The original CompuServe user IDs consisted of seven octal digits in the form 7xxxx,xx - a legacy of PDP-10 architecture
Ooh. You know what? If you’re going to give your users a numeric ID, octal makes great sense — you only lose two numbers, and it’s computationally much cheaper to convert from the ID string to octal than to a binary representation of decimal.
(Also, I’m frustrated I can’t remember what my CompuServe ID was.)
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