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## Main Question or Discussion Point

I'm trying to find if a number is odd or not, basically if X % 2 = 1.

Can this be expressed through some function? Like the sum of 1 + 2 .. +n is n(n+1) /2

Or as a Riemann sum?

I'm trying to add only the odd numbers from a random set of N integers to a sum.

Can this be expressed through some function? Like the sum of 1 + 2 .. +n is n(n+1) /2

Or as a Riemann sum?

I'm trying to add only the odd numbers from a random set of N integers to a sum.