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.
Find relatively common elements in matrix rows
Project Euler: Problem 6, Natural numbers, squares and sums.
Convert from Base 10 to base 5
Duplicate a character
Number of digits in an integer
An asteroid and a spacecraft
Volume of this donut
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