A factorial prime is a prime number that is one less or one more than a factorial. List of all known n!±1 primes:pic.twitter.com/ME6fodtsJz
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A factorial prime is a prime number that is one less or one more than a factorial. List of all known n!±1 primes:pic.twitter.com/ME6fodtsJz
208003!-1 is prime? How to proove it?
You're correct, because it's divisible by 2. 116! + 2 = (1*2*3*4*...*115*116) + 2 = 2*(1*3*4*...*115*116) + 2 = 2*[(1*3*4*...*115*116) + 1] = 2*[(116!)/2 + 1]
You can use similar argument to show that 116! + 3 isn't prime because it's divisible by 3, 116! + 4 isn't prime because it's divisible by 4, 116! + 5 isn't prime because it's divisible by 5, etc... Up to finally 116! + 116 is divisible by 116.
Factorial will definitely give an even no and +1 so must be a prime no.
This doesn't follow. It must be an odd number, but not all odd numbers are prime. E.g. 4! + 1 = 24 + 1 = 25 = 5*5, 5! + 1 = 120 + 1 = 121 = 11*11, 6! + 1 = 720 + 1 = 721 = 7*103, Not primes
And the following 115 integers aren't
No they're not, factorials end in a lot of zeros because they have lots of 2 and 5 as factors.
Dont forget the 10, 20, 30 .... 100 and 110 all add 1(or 2) 0's at the end too 
Value of 116!, i.e. factorial of 116 =
339310868445
189820119825
609358857320
323966355569
942077019636
620881232653
141763303362
545359712071
811696988685
849919416077
801110739282
362611996046
917975705058
510110720000
000000000000
00000000000.Add 1 and check.. 
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