From what I have read on the Odd Thomas website, the order is as follows:
1. Odd Thomas
2. Forever Odd
3. Brother Odd
4. Odd Hours
**5. In Odd We Trust (Technically, this is a prequel I believe to the whole series)
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There are just 9 Odd Thomas books by Dean R Koontz 1. Odd Thomas (2003) 2. Forever Odd (2005) 3. Brother Odd (2006) 4. Odd Hours (2008) 5. Odd Interlude (2012) 6. Odd Apocalypse (2012) 7. Deeply Odd (2013) 8. You Are Destined To Be Together Forever (2014)9. Saint Odd. There are also 3 graphic-novel prequels, their order is 1. In Odd We Trust, 2. OddIs On Our Side and 3. House of Odd as of 6/2022.
Best example is that an "odd" (or "even") function's Maclaurin series only has terms with odd (or even) powers. cos(x) and sin(x) are examples of odd and even functions with easy to calculate Maclaurin series.
The ratio is 1:2. For every even number there are 2 odd numbers. Fibonacci Series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... which is even, odd, odd, even, odd, odd, even, odd, odd, even, ... the pattern continues
You can use the formula for an arithmetic series for that.
Probably because polynomials and convergent power series in which all terms have even degree are even functions, and similarly for odd.
If you're using C, just check the low order bit. In binary, the low order bit of an odd number is 1, and the low order bit of an even number is 0.