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Re:Prime Number Spiral by jwmerrill on Sunday January 01, 2017 @08:48PM (#13298546)
You (re)discovered dual numbers!

https://en.m.wikipedia.org/wiki/Dual_number

Re:Prime Number Spiral by jacoblambda on Monday January 02, 2017 @01:10AM (#13299403)
Non mobile link for the lazy

https://en.wikipedia.org/wiki/Dual_number