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[Solved] Digits

 
Digits and Decimals
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June 14, 2021 10:38 am
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Staff 
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For a natural number n, let t_{n}  be the sum of all digits in  n, for instance,  t_{2009}=2+0+0+9=11,   evaluate

t_{1}+t_{2}+.....+t_{2009}.

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June 14, 2021 10:42 am
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Staff 
(@armor)
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https://matematick.com/forums/arithemetic-basics/digits/

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