June 30th, 2018, 03:56 AM  #1 
Senior Member Joined: Dec 2015 From: Earth Posts: 256 Thanks: 28  Infinite primes question
Are there infinitely many primes of form $\displaystyle p=1+n! \; $
Last edited by skipjack; July 1st, 2018 at 01:31 AM. 
June 30th, 2018, 01:16 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,627 Thanks: 622  
June 30th, 2018, 08:39 PM  #3 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,502 Thanks: 2511 Math Focus: Mainly analysis and algebra 
It has answer too. https://math.stackexchange.com/quest...oftheformn1 

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