However how do i prove 11 divides all of the possiblities? You then take this entire sequence and repeat the process (abbabaab). You'll need to complete a few actions and gain 15 reputation points before being able to upvote
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Instead, you can save this post to reference later. I'm trying to figure this one out I know that if a number is divisible by $3$, then the sum of its digits is divisible by $3$ For example a palindrome of length $4$ is always divisible by $11$ because palindromes of length $4$ are in the form of
$$\\overline{abba}$$ so it is equal to $$1001a+110b$$ and $1001$ and $110$ are
