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interests / rec.puzzles / ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...

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* ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...henh...@gmail.com
`- Re: ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...Richard Tobin

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Subject: ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...
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 by: henh...@gmail.com - Mon, 8 Aug 2022 19:48 UTC

( is 31 prime ? )
( is 331 prime ? )
( is 3331 prime ? )
( is 33 331 prime ? )
( is 333 331 prime ? )
( is 3 333 331 prime ? )
( is 33 333 331 prime ? )

Can _all_ 3333......3331 be Prime Numbers ?

Why does this work (so well) with 3's ?

------- pls (pls, Please... PLEASE ! ) wait a few days before posting answers or hints.

Re: ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...

<tcs3hk$1v4b$1@macpro.inf.ed.ac.uk>

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From: rich...@cogsci.ed.ac.uk (Richard Tobin)
Newsgroups: rec.puzzles
Subject: Re: ( is 31 prime ? ) ( is 331 prime ? ) ( is 3331 prime ? ) ...
Date: Mon, 8 Aug 2022 22:43:00 +0000 (UTC)
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Originator: richard@cogsci.ed.ac.uk (Richard Tobin)
 by: Richard Tobin - Mon, 8 Aug 2022 22:43 UTC

In article <962be1c7-0fff-42d2-a076-d5fca347a6een@googlegroups.com>,
henh...@gmail.com <henhanna@gmail.com> wrote:
>( is 31 prime ? )
>( is 331 prime ? )
>( is 3331 prime ? )
>( is 33 331 prime ? )
>( is 333 331 prime ? )
>( is 3 333 331 prime ? )
>( is 33 333 331 prime ? )
>
>Can _all_ 3333......3331 be Prime Numbers ?

As is noted at https://oeis.org/A051200 (which gives away the answer),
this sequence is mentioned in Martin Gardener's "The Last Recreations".

-- Richard

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