Find the sum, given the first term t1, the common ratio r, and number of terms n.
If input t1=1, r=1, n=7 then output y=7
If input t1=10, r=10, n=5 then output y=111110.
Project Euler: Problem 10, Sum of Primes
letter yes yes & letter no no
Getting the indices from a matrice
Output any real number that is neither positive nor negative
Least common multiple of many numbers
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