1, 5, 11 and 55
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1 and 5
It is: 1200/240 = 5
The tenth triangular number is equal to (10 x 11) / 2 = 55.
The greatest common factor (GCF) of two numbers is the largest number that divides evenly into both numbers. In this case, the factors of 55 are 1, 5, 11, and 55. The factors of 5 are 1 and 5. The greatest common factor of 55 and 5 is 5, as it is the largest number that divides evenly into both 55 and 5.
There are 4 numbers - 1, 55, 5, 11.