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

David Wilson davidwwilson at comcast.net
Sun Feb 26 22:12:38 CET 2012

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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