Abstract
Euler employs the formula naa+1 to give a list of numbers. Thanks to his work
on idoneals, he can quickly determine which numbers of this form are composite.
He uses n=232 in this paper, which is an idoneal. Normally, of course, it's
difficult to know whether large numbers are composite, so this is a useful
test. Then after he strikes the composite numbers from the list, he has big
prime numbers.
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