How can this be solved?

Exercise #2: Pentagonal numbers Write a C++ program that prompts the user to enter lower and upper bounds and the program then prints the Pentagonal numbers from the lower till the upper bound. A pentagonal number is defined as n(3-1/2 for n = 1, 2, ... Hence, the first few numbers are 1, 5, 12, 22, 35, 51. .. Sample input/output: Enter Lower and Upper bound integers1100 ter Lower and Upper bound integers > 1 150 entagonal Numbers from 1 till 100 are entagonal Numbers from 1 till 150 are S 12 2235 51 70 92 5 12 2235 51 78 92 117 145 1/1