When you express in base
If is written in base , what is its digit sum?
HINT: The "digit sum" of would be since .
The answer is 4040.
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1 solution
2 0 2 0 × 2 0 2 2 = 2 0 2 0 × 2 0 2 1 1 + 2 0 2 0 × 2 0 2 1 0 = ( 2 0 2 0 ) ( 2 0 2 0 ) 2 0 2 1
digit-sum = 2 0 2 0 + 2 0 2 0 = 4 0 4 0