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Smallest Sum Of Digits

Source: Mathematical Danube Competition 2017, Juniors P1

April 21, 2022
number theorysum of digitsromania

Problem Statement

What is the smallest value that the sum of the digits of the number 3n2+n+1,3n^2+n+1, nāˆˆNn\in\mathbb{N} can take?
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