It could be, but only if you’re not using a base-10 counting system. Since your number is 12 digits long, it must allow for the possibility of at least 1 “10” “11” or “12” which, in standard base-10 counting, are 2 digits, not 1. for example, with a 12 digit number, you could have “11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0” However, as you can see, for this to work, you need a 2-digit number.

If you’re using something like hexadecimal counting (where 10, 11, 12, 13, 14, and 15 are written as a single digit using letters of the alphabet A=10, B=11, ect) you could make a autobiographical number of more than 10 digits. In fact both “B000000000010000” and “9210000001000” would be valid autobiographical numbers for a base-16 (hexidecimal) or base-12 counting system, respectively.

Does that make sense? I’m not sure if I explained that well.

]]>https://www.timeanddate.com/sun/usa/boston?month=3&year=2019

For a more exact equality, I’d have to fire up Mathematica and hope it’s got a sunrise/sunset data set…

]]>So w = 1, x = 1, y = 8, z = 14

]]>28w + 29x + 30y + 31z = 731 ]]>