EditorinChief, interested primarily in computational number theory and allied fields.
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/Averages

Early draft of an article.

User:Charles R Greathouse IV/Chase sequences

'Chase sequences': Axxxxxx refers to Ayyyyyy, which refers to Azzzzzz...

User:Charles R Greathouse IV/Favorites

Some of my favorite sequences.

User:Charles R Greathouse IV/Format

Discusses the correct format of bfiles and how to repair illformatted bfiles.

User:Charles R Greathouse IV/Junk

Disreputable publishers, journals, etc.

User:Charles R Greathouse IV/Keywords

Information on keywords: when to use them, new ones to add, etc.

User:Charles R Greathouse IV/Metadata

Plans for OEIS metadata: keywords, categories, the index, etc.

User:Charles R Greathouse IV/Pari

Some PARI/GP tools.

User:Charles R Greathouse IV/Programs

Programs in the OEIS: types, format, etc.

User:Charles R Greathouse IV/Projects

Other mathematical databases, fingerprint databases, and similar projects

User:Charles R Greathouse IV/Properties

Sequence properties and classes

User:Charles R Greathouse IV/Rule of thumb

Sequences should take 1 hour to prepare for submission.

User:Charles R Greathouse IV/Standards

How to write up certain kinds of sequences.

User:Charles R Greathouse IV/Tables of special primes

Types of primes and their densities

User:Charles R Greathouse IV/To do

Sequences to work on and bfiles to fix.

User:Charles R Greathouse IV/Vanity

Sequences named after their discoverer.

User:Charles R Greathouse IV/Wiki

Tools for the OEIS wiki.

Projects:
Useful links:
A023194: Numbers
such that
is
prime.

{ 2, 4, 9, 16, 25, 64, 289, 729, 1681, ... }
In 2005, Zak Seidov wondered why all terms except the first are squares.* Gabe Cunningham provided the answer:
“From the fact that (...) the sumofdivisors function is multiplicative, we can derive that is even except when is a square or twice a square.”
“If , that is, is twice an odd square, then σ (n) = 3 σ ((2 k + 1) 2 ) 
. If , that is, is twice an even square, then is only prime if is a power of 2; otherwise we have for some positive integer .”
“So the only possible candidates for values of other than squares such that is prime are odd powers of 2. But σ (2 2 m +1) = 2 2 m +2 − 1 = (2 m +1 + 1) (2 m +1 − 1) 
, which is only prime when , that is, when . So 2 is the only nonsquare such that is prime.”
_______________
*
A055638 Numbers
for which
is prime:
{2, 3, 4, 5, 8, 17, 27, 41, 49, 59, 64, 71, 89, 101, 125, 131, 167, 169, 173, 256, 289, ...}
Sequences in the News
 Dec 25 2018 German HeiseNews "integers, please" column explains A003173 and OEIS.
 Feb 01 2018 Alphabet announced a $8,589,869,056 = $A000396(6) stock buyback.
 Jan 03 2018 Largest known term of A000043 announced: 77232917.
 Nov 18 2016 PrimeGrid proves that 10223 is not a Sierpinski number, since 10223 × 2 31172165 + 1 is prime. So no changes to A076336 for now.
 Sep 14 2016 Tom Greer discovers the twin primes 2996863034895 × 2 1290000 ± 1 using PrimeGrid, TwinGen and LLR.
 Jan 19 2016 Largest known term of A000043 announced: 74207281, also discovered by Curtis Cooper.
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).