12 and 18
2,3,5,7,11,13,15,17,19.
The only prime numbers with squares less than 20 are 2 and 3 Numbers containing 2 squared : 4, 8, 12, 16 Numbers containing 3 squared : 9, 18
the number is 18
Prime numbers
9 and 15 are the only two odd composite numbers less than twenty.
If the two numbers have no common factors other than 1, the LCM will be their product. If there are other common factors, the LCM will be less.
They all are prime numbers except 1
There are 31 numbers less than 1,000 which have an odd number of factors. They are: 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961.
The ones with less than three factors.
Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.
2 3 5 7 11 13 17 19
There are four odd numbers less that 100 that have 6 factor. This does not compare with even numbers that have 12 factors!