The sum of the digits of the number when expressed in decimal notation is?
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To begin with, let us notice that the number 1 0 0 0 2 0 1 4 is in fact a 1 followed by a lot of 0 's. In particular, it has 2 0 1 4 ⋅ 3 = 6 0 4 2 zeros in total.
Now let us also notice that any number in the form of 1 0 b , where b ≥ 5 gives a somewhat similar result when you subtract 2 0 1 4 from it.
Let us look at a few examples:
1 0 0 0 0 0 − 2 0 1 4 = 9 7 9 8 6 ; 1 0 0 0 0 0 0 − 2 0 1 4 = 9 9 7 9 8 6 ; 1 0 0 0 0 0 0 0 − 2 0 1 4 = 9 9 9 7 9 8 6
Additionally, it always ends in the sequence 7 9 8 6 and has an N number of 9 's in front of it, where N is the number of digits of 1 0 b minus 5 (we lose 1 digit due to the subtraction and 4 are reserved for the ending sequence).
Now let us take a look at our problem again. 1 0 0 0 2 0 1 4 is indeed a number of the sort mentioned above, and thus we may apply the rules to it. Since it is a 6 0 4 3 digit number, we know that it will have 6 0 3 8 9 's and it will also end in 7 9 8 6 when you subtract 2 0 1 4 from it.
Finally, the sum of the digits of 1 0 0 0 2 0 1 4 − 2 0 1 4 is 6 0 3 8 ⋅ 9 + 7 + 9 + 8 + 6 = 5 4 3 7 2