(n/2) times (n + 1)
eg for first 6 integers n = 6 and you have 6/2 x 6 + 1 = 3 x 7 = 21 which is correct.
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13
No, there is not. Given any positive integer n, n+1 is also a positive integer and it is larger.
26
Sn = n*(n+1)
10 + 25n, where n is an integer.