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.
The Goldbach Conjecture
Project Euler: Problem 7, Nth prime
Largest Twin Primes
Deleting an element in a matrix
Multiply a column by a row
Dancing with wolves?
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