# [seqfan] Re: A269254 and A034807

Bob Selcoe rselcoe at entouchonline.net
Thu Oct 26 08:35:04 CEST 2017

```Hmmm...   I must say, this problem is generating some very surprising
results!

Might the patterns for these sequences hold for a(n) = -1 as long as k = 2
is composite??  Is there a pattern for a(6726) when k > 2?

Cheers,
Bob Selcoe

--------------------------------------------------
From: "Don Reble" <djr at nk.ca>
Sent: Wednesday, October 25, 2017 11:37 PM
To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
Subject: [seqfan] Re: A269254 and A034807

>> 123, 724, 2525, 6726, 15127, 30248, ... I think. a(2525) didn't find
>> anything in my 20-minute test but I'll point out that a(724) = a(6726) =
>> 2, which strikes me as problematic.
>
>> a(724) ... = 2 [does] not fit the pattern as I expected.
>
>     The pattern is there. I bet 524899 is the only prime in sequence-724.
>
> [ 2] 1 * 524899
> [ 8] 725 * 144021200649068755
> [12] 524899 * 39571031999226338487852000499
> [17] 380026151 * 10872472737020062126372869343231202399299
> [22] 275138408425 * 2987303020541801301296497243182786705694900766618755
> [27] 199199827673549 *
> 820786545286299116538162753869638692811926731881098226527826099
>
> --
> Don Reble  djr at nk.ca
>
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>
```

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