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Re:Prime Number Spiral by imglorp on Sunday January 01, 2017 @05:22PM (#13297730)
There is a prime generating formula n^2 + n + 41 for n=0 to 39. Maybe this is related?

http://mathworld.wolfram.com/Prime-GeneratingPolynomial.html

Re:Prime Number Spiral by erk__ on Sunday January 01, 2017 @06:07PM (#13297941)
Yes it is, it is a bit hidden on the left side on the page in a details box.
Re:Prime Number Spiral by akhalr on Sunday January 01, 2017 @09:43PM (#13298712)
This also holds for n = -1. Not much real benefit; just extends the set of n to 41 consecutive integers.