ha i missed the if tens digit is even or odd comparison and wrote out every possible tens and ones digit comibination 00|04|08|12|16|20|24|28|32.....

i saw this question and couldnt fathom doing it without regex. great use of split and join

thanks i knew it worked without and i wasnt sure why, i was assuming the default start point is 1. but did not come to think of the possible error or how it is avoided

the 1 at the end is not necessary code completes without it.