Thread: x!^n+/-1 or x#^n+/-1? View Single Post
2020-11-13, 16:39   #2
Dr Sardonicus

Feb 2017
Nowhere

2·3·757 Posts

Quote:
 Originally Posted by rogue 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#?