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User:Charles R Greathouse IV

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Trustee and Editor-in-Chief, interested primarily in computational number theory.

I can be contacted via my Talk page here, or by email: my first name (charles) at my initials (crg4) dot com. Other email addresses may work as well.

User:Charles R Greathouse IV/Junk
User:Charles R Greathouse IV/Projects Other mathematical databases, fingerprint databases, and similar projects
User:Charles R Greathouse IV/Tables of special primes Types of primes and their densities
User:Charles R Greathouse IV/Rule of thumb Sequences should take 1 hour to prepare for submission.
User:Charles R Greathouse IV/Chase sequences 'Chase sequences': Axxxxxx refers to Ayyyyyy, which refers to Azzzzzz...
User:Charles R Greathouse IV/Programs Programs in the OEIS: types, format, etc.
User:Charles R Greathouse IV/Properties Sequence properties and classes
User:Charles R Greathouse IV/Metadata Plans for OEIS metadata: keywords, categories, the index, etc.
User:Charles R Greathouse IV/Favorites Some of my favorite sequences.
User:Charles R Greathouse IV/Keywords Information on keywords: when to use them, new ones to add, etc.
User:Charles R Greathouse IV/To do Sequences to work on and b-files to fix.
User:Charles R Greathouse IV/Format Discusses the correct format of b-files and how to repair ill-formatted b-files.
User:Charles R Greathouse IV/Pari Some Pari tools.
User:Charles R Greathouse IV/Wiki Tools for the OEIS wiki.

Projects:

Useful links:



[talk]

Sequence of the Day for August 24

A143212: Row sums of the Fibonacci multiplication table.

{ 1, 2, 8, 21, 60, 160, 429, ... }
a(n)
is divisible by
Fn
since
a(n) = F_n \sum_{i = 1}^{n} F_i = F_n \, (F_{n+2} - 1). \,


Sequences in the News

  • January 19, 2016 Largest known term of A000043 announced: 274207281, also discovered by Curtis Cooper.
  • March 2, 2014 Fredrik Johansson announces he's computed p(1020), which he says is approximately 1.8381765 × 1011140086259. Once confirmed and verified, it will be the largest known term of A000041.
  • December 6, 2013 Microsoft launches a challenge to find large non-Mersenne primes, A138837.
  • May 13, 2013 H. A. Helfgott submits a proof of the weak Goldbach conjecture, i.e. for odd numbers as sums of three primes: A007963 has no more zeroes.
  • January 25, 2013 Curtis Cooper discovers a new member of A000043, 57885161. Its index is not known but is at least 48.
  • January 13, 2013 The winners of the contest for new sequences in the OEIS at JMM 2013 were announced: A187824, A187771, and A187761.
  • September 21, 2012 Nick Berry, founder of Data Genetics, finds that the 17th most common 10-digit ATM PIN is 3141592654 (see A011546).


Complaints

I strive to live up to the highest ethical standards. If you feel that I have wrongly rejected one of your sequences (or otherwise failed to meet the expected standards), please leave a note at Complaints About Editing where it will be reviewed. I hope that in all cases you will first contact me (through the pink comment boxes, on my user page, or by email).

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