mersenneforum.org  

Go Back   mersenneforum.org > Extra Stuff > Blogorrhea > MattcAnderson

Reply
 
Thread Tools
Old 2015-08-04, 04:08   #1
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

49516 Posts
Default Matt A and the Online Encyclopedia of Integer Sequences

Hi Math People,

The Online Encyclopedia of Integer Sequences is a good reference for integer information. Using a program written by Henry, I lengthened A257138, a list of 13 tuples. I found that the existing 18th entry had one digit too many. I informed the referees and am now waiting for a response. I have contributed to OEIS many times.

http://oeis.org/A257138

Regards,
Matt

Last fiddled with by Uncwilly on 2022-06-14 at 15:58
MattcAnderson is offline   Reply With Quote
Old 2015-08-04, 06:55   #2
ewmayer
2ω=0
 
ewmayer's Avatar
 
Sep 2002
República de California

11,743 Posts
Default

Quote:
Originally Posted by MattcAnderson View Post
Hi Math People,

The Online Encyclopedia of Integer Sequences is a good reference for integer information. Using a program written by Henry, I lengthened A257138, a list of 13 tuples. I found that the existing 18th entry had one digit too many. I informed the referees and am now waiting for a response. I have contributed to OEIS many times.

http://oeis.org/A257138

Regards,
Matt
Right - #18 should read 317294052871840123. Length anomaly is much more obvious when the sequence is displayed in list form.
ewmayer is offline   Reply With Quote
Old 2015-08-10, 01:01   #3
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

3×17×23 Posts
Default

The referees are working on this entry
MattcAnderson is offline   Reply With Quote
Old 2015-08-13, 20:24   #4
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

49516 Posts
Default

Hi Math People,

You may see the draft entry for the OEIS entry I am working on now.

https://oeis.org/draft/A257138

I am still waiting on the referees.

Regards,
Matt
MattcAnderson is offline   Reply With Quote
Old 2015-08-17, 15:14   #5
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

3×17×23 Posts
Default

Hi Math People,

A257138 has been corrected.

Regards,
Matt
MattcAnderson is offline   Reply With Quote
Old 2016-09-10, 05:47   #6
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

3·17·23 Posts
Default A034856/

Hi Math People,

I was exploring oeis.org. This is the Online Encyclopedia of integer sequences.

oeis.org/A034856/

Many people have double checked this encyclopedia.

I read that for A034856, a(n) reduces to n*(n+3)/2 - 1.

When I work it through, I reach the expression n*(n-1)/2 -1.

Probably I am wrong and the encyclopedia is right.

I assume that binomial(n,k) = n!/(k!(n-k)!).
Can someone else check this expression?

Regards,
Matt
MattcAnderson is offline   Reply With Quote
Old 2016-09-10, 07:25   #7
GP2
 
GP2's Avatar
 
Sep 2003

13·199 Posts
Default

Quote:
Originally Posted by MattcAnderson View Post
oeis.org/A034856/

I read that for A034856, a(n) reduces to n*(n+3)/2 - 1.

When I work it through, I reach the expression n*(n-1)/2 -1.
Code:
binomial(n+1, 2) + (n − 1)

    n*(n+1)     2*(n−1)
=   -------  +  -------
       2           2

    n*n + 1*n + 2*n − 2
=   -------------------
             2

    n*(n+3) − 2
=   -----------
         2

    n*(n+3)
=   -------  −  1
       2
excellent observation GP2
some of us know that 1+2+3+...=n*(n+1)/2.

Last fiddled with by MattcAnderson on 2022-07-10 at 03:06
GP2 is offline   Reply With Quote
Old 2016-09-10, 14:20   #8
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

3·17·23 Posts
Default

Thank you GP2. You are correct.

Regards,
Matt
MattcAnderson is offline   Reply With Quote
Old 2021-08-24, 23:28   #9
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

100100101012 Posts
Post My contributions to OEIS

My best OEIS contribution is A201998. It was part of my "prime producing polynomial" project in 2006.

oeis.org/A201998
and
http://oeis.org/A235381
is some of my best work (from over 5 years ago)


Matt
Attached Files
File Type: pdf Matts OEIS contributions partial effort.pdf (238.7 KB, 60 views)
File Type: pdf page 1 of 6 search Matt C Anderson.pdf (684.6 KB, 64 views)

Last fiddled with by MattcAnderson on 2022-07-15 at 07:51 Reason: added second .pdf file added oeis links
MattcAnderson is offline   Reply With Quote
Old 2021-11-15, 11:52   #10
MattcAnderson
 
MattcAnderson's Avatar
 
"Matthew Anderson"
Dec 2010
Oregon, USA

3×17×23 Posts
Default oeis.org slash A010882

Hi again all,

I thought that it would be fun to share about a OEIS (Online Encyclopedia of Integer Sequences) entry.
This one is a finite and repeating pattern.
Specifically, it starts with one and goes like one, two, three and again one, two, three.

look - A010882

another simple look - https://oeis.org/A000081

another simple look - oeis.org/A12
This is the simplest of all possible positive sequences. It is the all ones sequence.

oeis.org/a10 I found the phi(n) function on my own in my explorations of the trinomial n^2+n+41.

Regards,
Matt

Last fiddled with by MattcAnderson on 2022-07-15 at 08:44
MattcAnderson is offline   Reply With Quote
Old 2021-11-16, 14:52   #11
Uncwilly
6809 > 6502
 
Uncwilly's Avatar
 
"""""""""""""""""""
Aug 2003
101×103 Posts

3×3,581 Posts
Default

My suggestion is, instead of making a new thread for each OEIS sequence that you find interesting, just have a single thread for all of them. I think it would be more interesting.
Uncwilly is offline   Reply With Quote
Reply

Thread Tools


All times are UTC. The time now is 10:23.


Sun Oct 2 10:23:28 UTC 2022 up 45 days, 7:52, 0 users, load averages: 0.82, 1.04, 1.02

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.

≠ ± ∓ ÷ × · − √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘ ∏ ∐ ∑ ∧ ∨ ∩ ∪ ⨀ ⊕ ⊗ 𝖕 𝖖 𝖗 ⊲ ⊳
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣ … ⋯ ⋮ ⋰ ⋱
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎𝜍 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔