core sequences, request for more "b" files

N. J. A. Sloane njas at research.att.com
Thu May 25 11:22:03 CEST 2006


Franklin proposed that several sequences should be promoted to 
have keyword "core". I have done that.

Debby Swayne and I have been working on the "graph" button. This
works, but will work better in a day or two, when it will use
for the second plot ALL the terms in the b000123.txt - type files,
the so-called "b" files.

The format for the b files is a list of pairs  n a(n)  with
one entry per line and no commas, no internal line breaks,
using the correct offset for the first column.

Example 1: b000040.txt, the primes:
1 2
2 3
3 5
4 7
...
9999 104723
10000 104729

Example 2, b000045.txt, The Fib. numbers:
0 0
1 1
2 1
3 2
4 3
5 5
...
500 139423224561697880139724382870407283950070256587697307264108962948325571622863290691557658876222521294125

Blank lines are OK.  Any comment lines should begin with #

I would like to get "b" files for more of the core sequences
(well, not A4 or A12) and other important sequences.
Especially those that will produce excellent music when the "listen"
(or "play") button is working.

So far I have these "b" files:

b000001.txt  b000045.txt  b000200.txt  b000796.txt  b004718.txt  b090822.txt
b000002.txt  b000055.txt  b000201.txt  b000797.txt  b005132.txt  b108618.txt
b000003.txt  b000069.txt  b000203.txt  b000960.txt  b005574.txt  b108620.txt
b000005.txt  b000079.txt  b000204.txt  b001113.txt  b007318.txt  b109890.txt
b000009.txt  b000081.txt  b000217.txt  b001168.txt  b010060.txt  b114835.txt
b000010.txt  b000108.txt  b000290.txt  b001223.txt  b018252.txt  b115569.txt
b000019.txt  b000110.txt  b000292.txt  b001359.txt  b025480.txt  b117153.txt
b000022.txt  b000111.txt  b000364.txt  b001477.txt  b046901.txt  b117154.txt
b000027.txt  b000120.txt  b000598.txt  b001511.txt  b049076.txt  b117825.txt
b000029.txt  b000129.txt  b000602.txt  b001969.txt  b051169.txt  b118131.txt
b000032.txt  b000140.txt  b000669.txt  b002496.txt  b056239.txt  b119422.txt
b000040.txt  b000142.txt  b000670.txt  b002808.txt  b064365.txt  b119423.txt
b000041.txt  b000182.txt  b000678.txt  b003602.txt  b066721.txt

How many terms should be in a "b" file?  I have been giving 100 to 500 terms
for those that grow rapidly, 1000 to 10000 if the entries are small,

You can find these "b" files in the OEIS entries.  They are always
the first %H line, so they are easy to find.

Neil

PS 
Please be very careful when computing the "b" files!

Don't send them with big numbers broken across lines
 with back slashes like this, which is wh\ <- backslash
 at some mail progr\ <- backslash
 ams d\ <- backslash
 o.  Don't do that!

And don't send them with = or = 2 0 characters at = 2 0
 the ends of=20
 lines = 2 0
 like this = 20
 which is also a problem with certain mail = 20
 programs





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