Observed arrival · 2026-10-07
Every Prime Number, On Demand
An infinite, browser-generated list of primes, with a control for jumping to a number and watching the sequence continue.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People exploring prime numbers interactively
- Worth noticing
- A primes-per-second counter makes the rising computational cost visible as the sequence advances.
Field notes
The page describes a segmented sieve of Eratosthenes running on the visitor’s computer, rather than a preloaded list. Scrolling advances the calculation, while the displayed primes-per-second rate makes the slowing computation observable; a Jump control targets primes around a chosen number. The extracted page shows the sequence beginning at 2 and includes Stop, How it works, About, and GitHub links.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue