21, 21, 21, 21 , 15, 1
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Impossible.
The sum of the first six odd numbers is 36.
999999 is six digits and odd.
5+5+5+5+1 That is only 5 numbers being added. There can be no answer for six numbers for the following reasons: The numbers are all odd. Two odd numbers make an even number. Two even numbers make an even number. 21 is odd. Take 6 odd numbers and add them up in pairs. Each pair of odd numbers gives an even number so there are 3 even numbers. Even + Even + Even = Even. So sum of any six odd numbers is even but 21 is not even.
1, 3, 5, 7, 9, 11 are six consecutive odd numbers whose sum is 36