[seqfan] Re: Largest (a1) in the OEIS
franktaw at netscape.net
franktaw at netscape.net
Sat Aug 27 02:37:48 CEST 2011
Some of this already exists. The underscore "_" represents an arbitrary
number, so 7,_,38 will match 7 (not 1), anything, 38. Likewise, two
underscores will match an arbitrary sequence of numbers - 11,__,99 for
your example.. (I'm not sure if it will match nothing, or if it
requires at least 1 number.)
There's been some discussion of matching at the beginning; the problem
is that "the beginning" may change. The 1,3,8 you're looking for may
actually be in the database as 0,1,3,8, with offset 0.
As part of my F-numbers proposal, I suggested allowing specification of
the index a number is to be found at. I.e., 1->1,3,8 would look for
a(1) = 1, followed immediately by 3 and 8.
Franklin T. Adams-Watters
-----Original Message-----
From: David Wilson <davidwwilson at comcast.net>
But seriously, some form of globbing might help with searching. For
example:
^1,3,8
to look up 1,3,8 at beginning of
7,?,38
to look up an 1 followed by unknown number followed by 38,
11,*,99
to look up 11 followed by zero or more unknown elements followed by 99,
etc.
On 8/26/2011 12:14 PM, David Newman wrote:
> I'm looking at A095646, but I don't see any line that entitiled
"Sequence in
> context." What am I doing wrong?
>
> Of course! The sequences are sorted - see the "Sequence in context"
line.
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