#oeis

[oeistournament]

Announcement: OEIS Tournament

This is @pc36thorn. Recently, I had the idea to do a poll bracket tournament on Tumblr with sequences from the OEIS (On-Line Encyclopedia of Integer Sequences). To determine the competitors, I will be accepting submissions. I have not yet decided how many competitors there will be, or when to cut off submissions. The rules for submissions are in the Google Form linked above. Seeding will be determined by how many submission a sequence gets, so don't be afraid to submit all your favorites even if they might have already been submitted.

[jan-aki]

The OEIS is really weird sometimes

[elation0]

A112798: Table where n-th row is factorization of n, with each prime p_i replaced by i. vs A122111: Self-inverse permutation of the positive integers induced by partition enumeration in A112798 and partition conjugation.

[mathhombre]

Ghee Beom Kim Double Spiral

Stuart Errol Anderson commented:

1, 1, 9, 49, 289, 1681, 9801, 57121, 332929, 1940449, 11309769, 65918161, 384199201, 2239277041, 13051463049, 76069501249, 443365544449, 2584123765441, 15061377048201, 87784138523761, 511643454094369, 2982076586042449, 17380816062160329, 101302819786919521, 590436102659356801

Square of the Pell-Lucas numbers, "numerators of continued fraction convergents to sqrt(2)."

The ratios converge (of course?)

OEIS has 'The ratio a(n+1)/a(n) converges to 3 + 2*sqrt(2). - Richard R. Forberg, Aug 14 2013' and 'a(n) = (((1+sqrt(2))^(2n) + (1-sqrt(2))^(2n)) + 2*(-1)^n)/4 - Lambert Klasen'

And someone found Rick Mawbry's page for this related double spiral...

Which must mean that A090390 must also give a sum for 1/2...

1/(2+1/r)(1+1/r+1/r^2+...)=1/2 where r is the limit ratio.

Oh! That doesn't work because the perfect ratio doesn't make a rectangle!

Of course I had to make in GeoGebra.

[madeofkaons]

i will never cease to be amused by the oeis website

[biggest-gaudiest-patronuses]

put me back in the oven i am NOT done baking

[jockw]

Can we not forget about this please

[germanpostwarmodern]

Gustav-von-Schmoller-Schule (2001-03) in Heilbronn, Germany, by Lederer Ragnarsdóttir Oei. Photo by Roland Halbe.

[wishem]

hot girl summer

this art style is now available in my commissions as the Shaded option.

[akuzonprime]

[3:21 PM] "Solomon? Are you also visiting?" The brothers ask the wizard when he greets them at your door, unaware that you have been living together in the human world for quite some time now.

[aurelion-solar]

Artist Spotlight: Nick Oei

Role: Concept Artist

Twitter - ArtStation

In light of Riot Games laying off 11% of their staff globally, I want to make a series of posts highlighting the portfolios of those affected, so that we can appreciate their contributions to the world of Runeterra and continue to support them. You can find a full list of those known to be affected here.

DRX Akali & Aatrox Concept Art (source)

Inkshadow Volibear Concept Art (source)

Primal Ambush Talon Concept Art (source)

Street Demons Rengar Concept Art (source)

Union Jack Fiddlesticks VGU (source)

Captain Volibear VGU (source)

Soul Fighter Sett & Primal Ambush Vi Explorations (sources 1, 2)

[d-criss-news]

Via Kristen Faith Oei's Instagram Story (June 8th, 2025)

[nattikay]

Nimun nìmun voìk seri na skxawng (stum po 'evengsìn kllpolä ulte tsakrr sngä'i zivawng ÓwÒ;) Nimun acting like an idiot again (she nearly landed on a kid and then started screaming)

[elation0]

A246169: Decimal expansion of a constant related to identity trees vs A004111: Number of rooted identity trees with n nodes (rooted trees whose automorphism group is the identity group).

[daykuronuma]

[ochtendstorm]

‘s nachts slapen mijn grenzen terwijl mijn verdriet doorklinkt als een drilboor

wanneer ik overdag weer ‘mens’ moet zijn doe ik de bergen verdwijnen en zet ik de schijn op

de schijn wringt tegen mijn zijn de tranen plakken aan mijn wangen

heb ik geroepen? heb ik verloren? heeft iemand mij gehoord?