the largest int64 integer is 2048 times larger than the largest double integer
The kind of problem where the test suite just gives away the answer.
Does anyone know why this wouldn't work?
A very good reason why it would NOT work. You returned a double precision number. But a double can only store integers correctly as large as 2^53-1.
Project Euler: Problem 7, Nth prime
02 - Vector Variables 1
Perfect Square or not
Element by element multiplication of two vectors
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