what are odd numbers?

Answer 1

Let k be an integer, then 2k+1 is an odd number for each possible integer k.

Answer 2

Any odd number can be written, in general form, as 2n + 1, where n = 0, 1, 2, 3, .....
If n = 0, 2(0)+1 = 1
n = 1, 2(1)+1 = 3
.
.
n = 5, 2(5)+1 = 11.

As others have written, the odd numbers are: 1,3,5,7,9,...
Not all odd numbers are prime, ex. 9, 15, 21, etc.

Answer 3

any number that doesn't dividly evenly by 2.
the formular for an odd number is
(2n+1) n being any number. This works because any number multiplied by two is divisible by two, and is thus an even number. Then, if you add one to any even number, the result is an odd number.
Eg. 1, 3, 5, 7, 9, 11, 13, 15, 17
Note: All prime numbers are odd numbers

Answer 4

Even numbers are all integers that are multiples of 2: {..., -6, -4, -2, 0, 2, 4, 6, ...}

Odd numbers are integers that aren't even: {..., -5, -3, -1, 1, 3, 5, ...}

Answer 5

Numbers whose factors are only 1 and that number. Hence the term odd.

Answer 6

Crap Face is wrong. 2 is a prime number, and it's an even number, the only even prime number. Does that make it an odd prime number? Anyone?

Answer 7

any # that doesn't end with a 2, 4, 6, 8, or 0 like 13

Answer 8

the definition of an odd number is (2n+1), n being all integers.

Answer 9

Integers that are not integer multiples of 2.
ex: 1, 3, 5, 7 etc

Answer 10

Odd numbers are numbers that cant be divided by two. 1,3,5,7,9... are odd numbers.
Even numbers are numbers that can be divided by two.
2,4,6,8,10... are even numbers.
Zero (0) is considered to be an even number.