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 June 22nd, 2016, 05:53 PM #1 Newbie   Joined: Jun 2016 From: Bradford Posts: 1 Thanks: 0 Prime question I have a formula to find primes up to a trillion within a range of 40 upwards of the number. So two numbers calculated together I know a prime is within a 40 number range of that sum. 99% within 30 so is this already known? And I realise it could be fluke. occasionally the number is a prime itself. I can't go past a trillion using excel, and guess you get a lot of this, from would bes thinking they've found something. My understanding is that there is hardly any formula that can help you find primes. Thank you.
June 22nd, 2016, 08:29 PM   #2
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Quote:
 Originally Posted by Matthewsx7 I have a formula to find primes up to a trillion within a range of 40 upwards of the number. So two numbers calculated together I know a prime is within a 40 number range of that sum. 99% within 30 so is this already known? And I realise it could be fluke. occasionally the number is a prime itself. I can't go past a trillion using excel, and guess you get a lot of this, from would bes thinking they've found something. My understanding is that there is hardly any formula that can help you find primes. Thank you.
Before we can tell you we'll need you to post the method.

-Dan

June 23rd, 2016, 08:54 AM   #3
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This is a PM I received from Matthewsx7.

Quote:
 Hello Topsquark, I think I have spotted an interesting pattern in the primes x*33 *x-1)+1 (x=2=199, I write that just in case I wrote it wrong) there is a bound of 40 to where the next prime will be found. (Sometimes it will be prime itself) I don't know if this is already known I can't go past a trillion with excel choosing consecutive number at random. 98% of time it is less than 30 to the next prime. Never less than 4. 170 numbers calculated so far and it holds true. I'm very much an ametuer, so could just be fluke, or coincidence. i'd like to keep it private, if it is correct, as i have feeling there is some other interesting stuff happening Thank you Lee.

 June 23rd, 2016, 05:23 PM #4 Senior Member   Joined: May 2016 From: USA Posts: 1,310 Thanks: 551

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