21 and 30 if you're only counting distinct factors.
Add 25 and 32 if you're not.
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65 and 77
65 and 77
323, 578 and 5929
If an odd number has more than two factors then it is a composite number but if it has only two factors then it is a prime number. Although all prime numbers are odd except for 2 many more odd numbers are composite numbers having more than two factors as for example 21 is an odd number whose factors are 1, 3, 7 and 21.
29 = 512 36 = 729 26*32 = 576