Problems on these two questions

Sun Nov 18 20:52:35 EST 2012

I all of the other problems but I have issues with these:
1.Given a positive integer n , assign True to is_prime if n has no factors other than 1 and itself. (Remember, m is a factor of n if m divides n evenly.) 
2.An arithmetic progression is a sequence of numbers in which the distance (or difference) between any two successive numbers if the same. This in the sequence 1, 3, 5, 7, ... , the distance is 2 while in the sequence 6, 12, 18, 24, ... , the distance is 6. 
 Given the positive integer distance and the positive integer n , associate the variable sum with the sum of the elements of the arithmetic progression from 1 to n with distance distance . For example, if distance is 2 and n is 10 , then sum would be associated with 26 because 1+3+5+7+9 = 25 . 
Thanks in advance.