# [seqfan] Re: [math-fun] Mathematical hell, sequence and the sequence A007699

Neil Sloane njasloane at gmail.com
Sun Feb 26 23:07:46 CET 2012

```David, the convention for the offset of a decimal constant
has not changed. The number 123.55555555... would produce
the sequence 1 2 3 5 5 5 5 5 ... with offset 3
Neil

On Sun, Feb 26, 2012 at 4:12 PM, David Wilson <davidwwilson at comcast.net>wrote:

> This is interesting, because A117853 are the leading digits of a decimal
> expansion of a very large integer
> (having 9152052 digits). If we are numbering the digits according to their
> place (exponent of 10), the
> first digit should be indexed 9152051, the last 0, and the index
> decreasing. When did we start allowing
> decreasing indexes in the OEIS (not that I disapprove)?
>
>
> On 2/26/2012 3:48 PM, Charles Greathouse wrote:
>
>> A117853 has offset 9152052, which is one of the largest.  There are a
>> few sequences (well, at least one that I've seen) that have offset 1
>> because the true offset would be too large to record.
>>
>> Charles Greathouse
>> Analyst/Programmer
>> Case Western Reserve University
>>
>> On Sun, Feb 26, 2012 at 3:19 PM, Marc LeBrun<mlb at well.com>  wrote:
>>
>>> It might be good for sequences like these to also submit (for instance)
>>>
>>>  a(n) := A007698(n) - A007699(n),
>>>
>>> which would have offset 1403.
>>>
>>> This makes me wonder: what are the largest offsets in the OEIS?
>>>
>>> Further, it would seem that this difference sequence must obey a
>>> recurrence
>>> relation that somehow combines those of its "parents"--can we write it
>>> down?
>>>
>>>
>>>
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--
Dear Friends, I will soon be retiring from AT&T. New coordinates:

Neil J. A. Sloane, President, OEIS Foundation
11 South Adelaide Avenue, Highland Park, NJ 08904, USA