63 / 3 = 21
The middle number is 21
The odd numbers next to 21 are 19 and 23
19 + 21 + 23 = 63
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The integers are 16, 17 and 18.
The integers are 19, 20 and 21.
Those three odd integers are 43, 45, and 47.
They are -15, -14 and -13.
a+(a+d)+(a+2d)=-15