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Old 2020-11-13, 16:39   #2
Dr Sardonicus
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Feb 2017

2·3·757 Posts

Originally Posted by rogue View Post
Is there any interest from anyone here in searching for primes in the form x!^n+/-1 or x#^n+/-1? I would refer to them as "power factorial" or "power primorial". As far as I know these forms have never been searched or n>1. It would be fairly easy to modify fsieve and psieve to support them.
Presumably you mean

\Phi_{n}(x!)\text{, }\Phi_{2n}(x!)\text{,}

or the same polynomials with the argument x! replaced with x#?
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