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Every number in the mathematical universe can be made with consecutive numbers PROVIDED that negative numbers are permitted. Think of a number you're trying to make with consecutive numbers as x. Now take one from x to make x-1. If you take 2(x-1) away from you end up with -x+2. Now take all the numbers from x-1 to -x+2. If you add all these numbers together you get 0. Then add x

e.g. 8-1=7
2x7=14
7-14=-7
-7+-6+-5+-4+-3+-2+-1+0+1+2+3+4+5+6+7=0 0+8=8