Is the sum of 2007 consecutive natural numbers odd or even?
The sum of 2007 consecutive natural numbers may be even or odd
(1 + 2007) * 2007 / 2 = 2015028, continuous numbers start from odd numbers and the sum is even,
(2 + 2008) * 2007 / 2 = 2017035, a continuous number starts from an even number, and the sum is an odd number