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Old 2018-12-01, 16:43   #9
Batalov's Avatar
Mar 2008

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Originally Posted by devarajkandadai View Post
... and b) 80*m^2 + 53*m + 7 is exactly divisible by 20.
This simply means that m=20*q+1. And therefore what you are trying to say looks like a Chernick-like recipe for 3-prime factor Carmichael numbers: "if 40*q + 3, 200*q + 11 and 320*q + 17 are all prime, then their product is a Carmichael number".

With a difference that Chernick proved his and you are "just saying". To what limit did you even test it?
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