1,2,4
1,5
1,9
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Composite numbers with an odd number of factors are numbers that are squares: The 3 factors of 4 = 22 are 1, 2, and 4. The 3 factors of 9 = 32 are 1, 3, and 9. The 5 factors of 16 = 42 = 24 are 1, 2, 4, 8, and 16. The 3 factors of 25 = 52 are 1, 5, and 25. The 9 factors of 36 = 62 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The 3 factors of 49 = 72 are 1, 7, and 49. The 7 factors of 64 = 82 are 1, 2, 4, 8, 16, 32, and 64. The 5 factors of 81 = 92 are 1, 3, 9, 27, and 81. The 9 factors of 100 = 102 are 1, 2, 4, 5, 10, 20, 25, 50, and 100. The 3 factors of 169 = 132 are 1, 13, and 169. The 7 factors of 729 = 272 are 1, 3, 9, 27, 81, 243, and 729.
There are actually 9 factors of 100 including 100. They are 1, 2, 4, 5, 10, 20, 25, 50, 100.
The factors of 4 are: 1, 2, and 4.The only prime factor of 4 is: 2.The factors of 9 are: 1, 3, and 9.The only prime factor of 9 is: 3.
4 - (-5) = 4 + 5 = 9.
4, 9, 25, 49, 121