January 10, 2017
Today’s exercise is easy to describe, but has some tricky edge cases that make it hard to implement:
Given a string of the prime numbers appended sequentially — 2357111317192…. — and an index n, return the string of five digits beginning at index n. For instance, the five characters starting at index n = 50 are 03107. The first 61 characters of the prime string are shown below:0 1 2 3 4 5 6 0123456789012345678901234567890123456789012345678901234567890 2357111317192329313741434753596167717379838997101103107109113
Your task is to write a program to find the substring of the string of all primes starting at the nth character. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.
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