1 , 2 , 3 , 4 , 5 , 6 are the smallest consecutive natural numbers.
Thus :
1 + 2 + 3 + 4 + 5 + 6 =
3 + 3 + 4 + 5 + 6 =
6 + 4 + 5 + 6 =
10 + 5 + 6 =
15 + 6 =
21
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