There are 20.
{21, 23, 25, 27, 29, 31, 33, 35, 37, 29, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59}
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how many odd numbers is there between 20 and 158
20 of them.
There are 20 odd numbers in 40.
All the numbers in that range that end with 1, 3, 5, 7, or 9.
The numbers 23 and 29 are the only prime numbers between 20 and 30