Odd Numbers

. :. ::. :::. ::::. :::::. ::::::. and so on
1 3 5 7 9 11 13 and so on
 
ALL numbers NOT in the 2 times table are odd numbers
ALL odd numbers leave a remainder of 1 if divided by 2
ALL odd numbers end in 1, 3, 5. 7 or 9
Examples
We can tell that 71 is odd because it ends in 1
We can tell that 123 is odd because it ends in 3
We can tell that 2345 is odd because it ends in 5
We can tell that 64747 is odd because it ends in 7
We can tell that 567989 is odd because it ends in 9

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