2026 as a number

[Ed Pegg]

45^2  +1    but there are a lot of ways to hit 2025.  
2^11 - 2*11   A005803  
A033483  Number of disconnected 4-valent graphs with 17 nodes.  
FromContinuedFraction[{45, {90}}]  
Round[Cosh[9]/2]  

various items at 
https://community.wolfram.com/groups/-/m/t/3594686  

anything amazing for 2026?  

[Allan Wechsler]

Is there a good way to search for the sequence that has 2026 in the earliest possible position, other than downloading the database?

-- Allan

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[Sean A. Irvine]

There are two sequences that start with 2026:

https://oeis.org/search?q=A031768&go=Search

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[Sean A. Irvine]

Early cases:

A031768 (1st)

A156856 (1st)

A250145 (2nd)

A197066 (3rd)

No accounting made for offset.

But I cheated using the stripped.gz file to find these.

On Tue, 30 Dec 2025 at 11:46, Allan Wechsler <acw...@gmail.com> wrote:

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[mi...@vincico.com]

Just came across the following article this morning, which discusses current year numbers including 2026 (I have not finished it):

 

Iva Kodrnja, On Remarkable Properties of Number 2025, KoG (Croat. Soc. Geom. Graphics) 29 (2025). [https://doi.org/10.31896/k.29.8]

 

Best regards,

Mike

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[Michael Branicky]

Allan,

You can try https://sequencedb.net and search for 2026@0 then 20226@1 etc.

or directly:

https://sequencedb.net/index.html?s=2026%400

https://sequencedb.net/index.html?s=2026%401

etc.

It will give A-numbers for OEIS matches

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