They are: 17 19 23 29 31 37 41 43 47 53 59 61 and 67
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There are 69 odd numbers between 20 and 158.
69 + 18 = 67
16 multiplied by 69 is 1,104.
The sum of any set of postiive integers from 1 to n including n is equal to n(n+1)/2 In this instance, 69 x (69 + 1) / 2 = 2415, therefore, the sum of the numbers 1 to 69 is 2415.
lcm of 46 and 69 = 139 an easy way to figure this out is by multiplying together the following: prime factors they have in common * prime factors that just 46 has * prime factors just 69 has.