#oeis
Live, measured metrics for the hashtag #oeis from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #oeis
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-09-16 10:54 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-09-16 10:54 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-09-16 10:54 UTCEverything below is measured over the latest 40 public posts (spanning ~461 hours).
Posting hours (UTC) — busiest: 03:00
Languages: English (40)
Avg boosts / post: 1
Top of the latest posts
Write 25 in binary: 11001. Interpret that as if it was in ternary: 3⁴+3³+1 = 109, a prime number! What other composite numbers does it work for? I quickly realised that it has to be odd, and furthermore, has to give an irreducible polynomia
This week's Rutgers Experimental Mathematics seminar is Neil Sloane, prompted by the #OEIS soon reaching 400,000 sequences. 17:00 EST (UTC-4), September 10th. https://sites.math.rutgers.edu/~zeilberg/expmath/
The numbers of number-conserving cellular automata with neighbourhood size 3 (or equally, radius 1) has now been entered into #OEIS, as https://oeis.org/A394094. I thought I had to enter it myself, but before I could do it, someone else had
What “oeis” means
WikipediaThe On-Line Encyclopedia of Integer Sequences (OEIS) is an online database of integer sequences. It was created and maintained by Neil Sloane while researching at AT&T Labs. He transferred the intellectual property and hosting of the OEIS to the OEIS Foundation in 2009, and is its chairman.
“On-Line Encyclopedia of Integer Sequences” on Wikipedia (CC BY-SA) →#oeis across platforms
every network with a public tag surfaceFollow #oeis straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/oeis