There are two; 29 and 31.
17, 19, 23, 29, and 31
They are: 23 29 31 and 37
23, 29 and 31
17, 19, 23, 29, and 31
29
29
There are two; 29 and 31.
27
17, 19, 23, 29, and 31
23 29 31 and 37.
They are: 23 29 31 and 37
They are: 23 29 31 and 37
23, 29, 31, 37
23, 29 and 31 are prime, the rest are composite.
23, 29 and 31
17, 19, 23, 29, and 31