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
More information about the SeqFan
mailing list