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Show HN: Kage – Shadow any website to a single binary for offline viewing

https://github.com/tamnd/kage
263•tamnd•4h ago•60 comments

Zinnia: A modular 64-bit Unix-like kernel written in Rust

https://zinnia-os.org/
22•mrunix•37m ago•1 comments

Yserver: A modern X11 server written in Rust

https://github.com/joske/yserver
61•Venn1•2h ago•25 comments

Rio de Janeiro's "homegrown" LLM appears to be a merge of an existing model

https://github.com/nex-agi/Nex-N2/issues/4
223•unrvl22•6h ago•122 comments

Chaosnet (1981)

https://tumbleweed.nu/r/lm-3/uv/amber.html
39•RGBCube•2h ago•4 comments

Firewood Splitting Simulator

https://screen.toys/firewood/
521•memalign•4d ago•177 comments

Show HN: Trace – Offline Mac meeting transcripts you can flag mid-call

https://traceapp.info
47•AG342•1d ago•9 comments

The first game engine for robotics

https://luckyrobots.com/
18•arnejenssen•2d ago•6 comments

Segmented type appreciation corner (2018)

https://aresluna.org/segmented-type/
46•unexpectedVCR•3d ago•9 comments

Ask HN: What are you working on? (June 2026)

115•david927•5h ago•429 comments

Caddy compatibility for zeroserve: 3x throughput and 70% lower latency

https://su3.io/posts/zeroserve-caddy-compat
130•losfair•7h ago•41 comments

Perlisisms (1982)

https://www.cs.yale.edu/homes/perlis-alan/quotes.html
80•tosh•6h ago•36 comments

Formal methods and the future of programming

https://blog.janestreet.com/formal-methods-at-jane-street-index/?from_theconsensus=1
143•eatonphil•9h ago•49 comments

Inverse Rubric Optimization: A testbed for agent science

https://fulcrum.inc/2026/06/09/inverse-rubric-optimization.html
15•etherio•3d ago•0 comments

The only scalable delete in Postgres is DROP TABLE

https://planetscale.com/blog/the-only-scalable-delete
101•hollylawly•3d ago•41 comments

Lisp's Influence on Ruby

https://blog.tacoda.dev/lisps-influence-on-ruby-6a54f1a7740e
198•tacoda•3d ago•43 comments

FarOutCompany

https://faroutcompany.com/
87•bookofjoe•7h ago•14 comments

I indexed 669 GB of my GoPro videos using my M1 Max computer and local ML models

210•iliashad•6h ago•42 comments

The Birth and Death of JavaScript (2014)

https://www.destroyallsoftware.com/talks/the-birth-and-death-of-javascript
195•subset•9h ago•116 comments

Not everyone is using AI for everything

https://gabrielweinberg.com/p/people-are-consuming-ai-like-they
378•yegg•6h ago•399 comments

Linux 7.1

https://lore.kernel.org/lkml/CAHk-=wi4BF4bMhZNZ1tqs+FFV4OuZRe3ZqdWB+LxRLmRweUzQw@mail.gmail.com/T/#u
181•berlianta•5h ago•56 comments

How to earn a billion dollars

https://paulgraham.com/earn.html
362•kingstoned•9h ago•1054 comments

Quivers: A year of linear algebra by drawing arrows

https://lisyarus.github.io/blog/posts/quivers-a-year-of-linear-algebra-by-drawing-arrows.html
31•ibobev•4d ago•6 comments

Global density and biomass of arbuscular mycorrhizal fungal networks

https://www.science.org/doi/10.1126/science.adu4373
36•zdw•1d ago•4 comments

Show HN: 3D print Z reinforcement via injected loops

https://mgunlogson.github.io/magma/
47•mgunlogson•5d ago•18 comments

Show HN: Discover Wikipedia articles popular on Hacker News

https://www.orangecrumbs.com/
14•octopus143•3h ago•2 comments

How did Atari apply side art to Arcade Cabinets?

https://arcadeblogger.com/2026/06/14/how-did-atari-apply-side-art-to-arcade-cabinets/
72•msephton•8h ago•20 comments

Vibe Coder vs. Software Engineer

https://yusufaytas.com/vibe-coder-vs-software-engineer
24•yusufaytas•1h ago•1 comments

Abu Fanous

https://en.wikipedia.org/wiki/Abu_Fanous
8•joebig•35m ago•0 comments

Free SQL→ER diagram tool, runs in the browser, nothing uploaded

https://sqltoerdiagram.com/
333•robhati•17h ago•65 comments
Open in hackernews

Right-Truncatable Prime Counter

https://github.com/EbodShojaei/Right-Truncatable-Primes
9•rainmans•1y ago

Comments

throwawaymaths•1y ago
Curious about base 2. Obviously if you hit a 0 it's immediately not prime, but maybe adjust the rules so:

- you drill through as many 0's on the right.

- you finish on 1.

3, 5, 7, 11, 13, 15, 17 are all right truncatable, 19 is the first non-truncatable prime in this scheme.

nh23423fefe•1y ago
i dont think smaller radixes make the problem more interesting. the problem is interesting because base 10 has a large branching factor
throwawaymaths•1y ago
I think in the base2 reformulation I propose we do not know for certain if the list of numbers terminates, as all Fermat primes are in the set and we don't know if there are infinitely many Fermat primes.

For base-10 and the original rules the set is provably closed.

"Drilling through zeros" makes the branching unbounded.

jinwoo68•1y ago
There's a Project Euler problem for finding truncatable prime numbers, from both left and right: https://projecteuler.net/problem=37
thechao•1y ago
Just in case any else is wondering: there are only 83 right-truncatable primes (RTP) and that is it. There's two constraints that let you see this "immediately":

1. An RTP must start with {2,3,5,7,9}; and,

2. An RTP must end with {1,3,7,9}.

So, let's take the largest RTP (73939133) and try to "extend" it: there are only four possible extensions: 73939133[1], 73939133[3], 73939133[7], 73939133[9]. None of these are prime. This holds for the other 8-digit RTPs. Therefore, there is no extension to a 9-or-longer RTP. Thus, the list is exhaustive.