[seqfan] Re: Sum divides concatenation

[Jack Brennen]

As I posted already, it's 1913932644.



Robert G. Wilson, v wrote:
> ALCON,
> 
>     The next term is over 1.1 billion.
> 
> Bob.
> 
> ----- Original Message ----- 
> From: "Charles Greathouse" <charles.greathouse at case.edu>
> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
> Sent: Monday, September 28, 2009 1:23 PM
> Subject: [seqfan] Re: Sum divides concatenation
> 
> 
> It's not in the database.  The terms are
> 1, 2, 6, 250488, 19986, 118030, 133970, 693810, 2231328, 3407286,
> 5733260, 25176334, 75529002, ...
> 
> The next term is more than 100 million.  A good program could find
> these values quickly, but I just used a few minutes of brute force.
> 
> Charles Greathouse
> Analyst/Programmer
> Case Western Reserve University
> 
> On Mon, Sep 28, 2009 at 12:35 PM, Jack Brennen <jfb at brennen.net> wrote:
>> The next term would be 250488, if that's any help:
>>
>> 126250488 == (1+2+6+250488) * 504
>>
>> Eric Angelini wrote:
>>> Hello SeqFans,
>>> I don't know how to find more terms -- thus I don't know
>>> if this is old hat in Neil's database:
>>>
>>> 1, 2, 6, ...
>>>
>>> The sum of the first n integers divides the concatanion of
>>> the first n integers; always prolong the seq with the smal-
>>> lest _natural_ number not yet used:
>>>
>>> 1 divides 1 --> HIT
>>> 1+2 (=3) divides 12 --> HIT
>>> 1+2+3 (=6) does not divide 123
>>> 1+2+4 (=7) does not divide 124
>>> 1+2+5 (=8) does not divide 125
>>> 1+2+6 (=9) divides 126 --> HIT
>>> etc.
>>>
>>> Best,
>>> É.
>>>
>>>
>>> _______________________________________________
>>>
>>> Seqfan Mailing list - http://list.seqfan.eu/
>>>
>>>
>>
>>
>> _______________________________________________
>>
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
> 
> 
> _______________________________________________
> 
> Seqfan Mailing list - http://list.seqfan.eu/ 
> 
> 
> 
> _______________________________________________
> 
> Seqfan Mailing list - http://list.seqfan.eu/
> 
>