The Bijective Base-26 System
The bijective base-26 system is also known as base 26 without a zero. It is a base twenty-six positional numeral system that does not use a digit to represent zero. It uses digits "A" to "Z" to represent one to twenty-six.
The number sequence goes A, B, C, ..., X, Y, Z, AA, AB, AC, ..., AX, AY, AZ, BA, BB, BC, ... This is what Microsoft Excel uses to identify columns in spreadsheets.
Each digit position represents a power of twenty-six, so for example ABC is "one, plus two, plus three units " since "A" is worth one, "B" is worth two, "C" is worth three.
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Read more about this topic: Bijective Numeration
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