The numbers with exactly six factors between 1 and 100 are those that are perfect squares. Perfect squares have an odd number of factors because they have one factor that is repeated (the square root of the number). The factors of a number come in pairs, except for perfect squares. In this case, the factors are 1, the square root of the number, and the number itself. Examples of numbers with exactly six factors between 1 and 100 are 4, 9, 25, and 49.
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Numbers that 6 factors 1-100: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96
Numbers that have exactly 6 factors 1-100: 12, 18, 20, 28, 32, 44, 45, 50, 52, 63, 68, 75, 76, 92, 98, 99
75 has six factors.
12, 18, 20, 28, 32, 44, 45, 50, 52, 63, 68, 75, 76, 92, 98, 99 have exactly six. Many others have more.
Six numbers. They are 1, 2, 4, 5, 10 and 20.
There are six prime numbers between 12 and 35: 13,17,19,23,29,31
There is only one multiple of six between those numbers - 42.