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A comment on 7 is the largest prime followed by a cubic number. Parent comment

Re:7 is the largest prime followed by a cubic number by jpegslayer on Monday September 03, 2018 @06:09PM (#17905200)
What about for n=4? I think the issue is that you're supposing that 2^n-1 is already prime.

Primes of this form are called Mersenne primes if you want more information on them.

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Re:7 is the largest prime followed by a cubic number by Tomminn on Monday September 03, 2018 @06:11PM (#17905209)
See update, I realized my facepalm at roughly the same time as you:)
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