Amongst others they can be 2+3+15 = 20 which is a multiple of 10
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EVERY three consecutive numbers add to a multiple of 3: Proof: numbers are n, n + 1 and n + 2. The total is 3n + 3 or 3(n + 1) This means that for any three consecutive numbers, the total is 3 times the middle number.
Well, darling, the numbers 11, 12, and 17 add up to 40, which is a multiple of 10. So, there you have it, sweetie, those three numbers fit the bill. Now go forth and impress someone with your math skills, honey!
76 + 77 + 78 three numbers in a row
That isn't possible. The three consecutive number are assumed to be integers; the sum of three consecutive integers is always a multiple of 3 (try it out).
Cubes of numbers are made by multiplying a number by itself three times.