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Q: What numbers have 5 or less factors?

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10,20,30,40,50,60,70,80,90

10, 20, and 30 all have factors of 2 and 5

They are: 2 3 5 and 7 all of which are prime numbers

All multiples of their lowest common multiple: lcm(3, 5, 7) = 105 → the numbers less than 400 with 3, 5, 7 as factors are: 105, 210, 315.

Numbers with 3 or 5 factors are called square numbers.

there are 3 no.2,3 & 5

10, 20 and 30

That could either be "What numbers have 5 factors" or "What numbers have 2 and 5 as factors." Prime numbers to the fourth power, like 16 and 81, have 5 factors. Any multiple of 10 has 2 and 5 as a factor.

1, 2, 3, 5, and 7

There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.

5 is a prime number having 1 and 5 as its only factors. It makes no difference to the factors of 5 if the digit 5 is in composite numbers.

Prime numbers

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