Call a number unremarkable if, when written in base 10, no two adjacent digits are equal. For example, 123 is unremarkable, but 122 is not. Find the sum of all unremarkable 3-digit numbers. (Note that 012 and 007 are not 3-digit numbers.)
Call a number unremarkable if, when written in base 10, no two adjacent digits are equal. For example, 123 is unremarkable, but 122 is not. Find the sum of all unremarkable 3-digit numbers. (Note that 012 and 007 are not 3-digit numbers.)