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-   -   giant number is not a prime (https://www.mersenneforum.org/showthread.php?t=25964)

 drmurat 2020-09-15 09:34

giant number is not a prime

I guess that 6 * 10 ^ (900.000.000.000) is not belog to twin prime number . any idea ?

 retina 2020-09-15 09:41

[QUOTE=drmurat;557011]I guess that 6 * 10 ^ (900.000.000.000) is not belog to twin prime number . any idea ?[/QUOTE]Given that the number you posted is divisible by 2 then that means you are correct, it isn't part of any prime sequence. :tu:

Can I now also guess an even number and claim that it doesn't belog [sic] to any twin prime?

 drmurat 2020-09-15 09:49

[QUOTE=retina;557012]Given that the number you posted is divisible by 2 then that means you are correct, it isn't part of any prime sequence. :tu:

Can I now also guess an even number and claim that it doesn't belog [sic] to any twin prime?[/QUOTE]

yes I guess that the number 6 x 10 ^ (900.000.000.000) + 18 x 10 ^ ( 450.000.000.000) + 1 also is not belong to twin prime number

 drmurat 2020-09-15 09:54

[QUOTE=drmurat;557016]yes I guess that the number 6 x 10 ^ (900.000.000.000) + 18 x 10 ^ ( 450.000.000.000) + 1 also is not belong to twin prime number[/QUOTE]

I also mention values of k in 6 x k +1 and 6 x k 1

 drmurat 2020-09-15 12:39

The giant number iş not twin prime

...

 R. Gerbicz 2020-09-15 13:58

[QUOTE=drmurat;557016]yes I guess that the number 6 x 10 ^ (900.000.000.000) + 18 x 10 ^ ( 450.000.000.000) + 1 also is not belong to twin prime number[/QUOTE]

Yes, that is true, since if N denotes your number then N+2 is divisible by 3 and N-2 is divisible by 107.

 drmurat 2020-09-15 14:15

[QUOTE=R. Gerbicz;557036]Yes, that is true, since if N denotes your number then N+2 is divisible by 3 and N-2 is divisible by 107.[/QUOTE]

This number isk value so we must find 6 x k and than we must look 6 x k+ 1 and 6 x k - 1to check primabilty but how did you calculated 107 easly

 R. Gerbicz 2020-09-15 14:50

[QUOTE=drmurat;557040]This number isk value so we must find 6 x k and than we must look 6 x k+ 1 and 6 x k - 1to check primabilty but how did you calculated 107 easly[/QUOTE]

I've thought that I understand you, but not. Learn more Maths, and more English.

 drmurat 2020-09-15 15:09

[QUOTE=R. Gerbicz;557042]I've thought that I understand you, but not. Learn more Maths, and more English.[/QUOTE]

Thanks for your advice. I Will do but how did you devide such a big number to107. How did you check primabilty so easly I also give much bigger samples

 paulunderwood 2020-09-15 15:21

[QUOTE=drmurat;557044]Thanks for your advice. I Will do but how did you devide such a big number to107. How did you check primabilty so easly I also give much bigger samples[/QUOTE]

This Robert at his computer:
:primenet:

Know that a*b mod n is the same as (a mod n) * (b mod n) :smile:

 drmurat 2020-09-15 15:41

[QUOTE=paulunderwood;557046]This Robert at his computer:
:primenet:

Know that a*b mod n is the same as (a mod n) * (b mod n) :smile:[/QUOTE]

Thanks you but my english is not so well. And This unswer Will change my life view. Can you explain step by step how can we devide This giant number to 107 easly

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