0
1 + 2 + 3 + 5 + 7 + 9 =
... assuming you mean "positive numbers".
Also, the phrasing could be taken in 3 ways.
Prime AND odd numbers would be the intersect of 2 groups, being 1+3+5+7, which totals 16.
What is in both sets, but not counting the overlap twice, being 1+2+3+5+7+9, which is 27.
or finally, taking them both as independent sets of data, being 1+1+2+3+3+5+5+7+7+9, which is 43
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Are odd numbers less than prime number?
No. Odd numbers can be greater than, smaller than, or equal to prime numbers.
How many odd prime numbers are less than 20?
Seven of them.
What are the odd prime numbers under 20?
The odd prime numbers less than 20 are 3, 5, 7, 11, 13, 17, and 19.
Why are square numbers one less than a prime number always even?
Prime numbers, except 2, are always odd (they would not be prime if they were even cos they would be divisible by 2.) 1 less than any odd number must be an even number.
Is a prime number odd or even?
All prime numbers other than 2 are odd numbers. 2 is the only even prime number.
