MathDB
Rioplatense L-1 2022 #4

Source:

December 13, 2022
number theory

Problem Statement

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.
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