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First I thought that all odd numbers 3, 5, 7, 9 etc can be found out by this method because they are a sum of one odd and one even numbers.
Then I tried some even numbers such as 6, 10, 12 and 14 and saw that they also can be added up like this. So I realised that even multiples of odd number (except 1) can also be added up like this.
But numbers such as 4, 8, 16, 32 etc with all factors even, don’t agree to this rule.
Then finally I derived a conclusion that all odd numbers (except 1) and their multiples follow this rule.