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Omni-MATH / Let L be the number formed by 2022 digits equal to 1, that is, L=1111…111. Compute the sum of the digits of the number 9L²+2L.

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problem

Let LL be the number formed by 20222022 digits equal to 11, that is, L=1111…111L=1111\dots 111. Compute the sum of the digits of the number 9L2+2L9L^2+2L.
Plain-text mathematical notation (without MathML)
Let L be the number formed by 2022 digits equal to 1, that is, L=1111…111.
Compute the sum of the digits of the number 9L²+2L.
Original LaTeX notation
Let $L$ be the number formed by $2022$ digits equal to $1$, that is, $L=1111\dots 111$.
Compute the sum of the digits of the number $9L^2+2L$.

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