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How's Linear so fast? A technical breakdown

https://performance.dev/how-is-linear-so-fast-a-technical-breakdown

85•howToTestFE•1h ago•34 comments

Building from Zero After Addiction, Prison, and a Felony

https://gavinray97.github.io/blog/building-from-zero-after-addiction-prison-felony

54•gavinray•1h ago•1 comments

Powering up a module from the IBM 604: an electronic calculator from 1948

https://www.righto.com/2026/06/ibm-604-thyraton-tube-module.html

47•elpocko•3h ago•12 comments

Silurus/ooxml: Pixel-faithful Office documents, rendered in the browser

https://github.com/yukiyokotani/office-open-xml-viewer

54•maxloh•2h ago•21 comments

What is the purpose of the lost+found folder in Linux and Unix? (2014)

https://unix.stackexchange.com/questions/18154/what-is-the-purpose-of-the-lostfound-folder-in-lin...

63•tosh•2d ago•29 comments

Cloning a Sennheiser BA2015 battery pack

https://blog.brixit.nl/cloning-a-sennheiser-ba2015-accu-pack/

76•zdw•1d ago•13 comments

Making Peace with Your Unlived Dreams

https://nik.art/making-peace-with-your-unlived-dreams/

41•herbertl•2h ago•14 comments

You'll never guess who made the first wireless telephone

https://signoregalilei.com/2026/05/31/youll-never-guess-who-made-the-first-wireless-telephone/

34•surprisetalk•3d ago•5 comments

My automated doubt development process

https://www.alexself.dev/blog/automated-doubt

16•aself101•2h ago•7 comments

Leiden Declaration on Artificial Intelligence and Mathematics

https://www.lms.ac.uk/news/leiden-declaration-on-ai-and-mathematics

27•_____k•1h ago•1 comments

The 29th International Obfuscated C Code Contest (IOCCC) 2025 Winners

https://www.ioccc.org/2025/

335•matt_d•14h ago•78 comments

The complete IPv4 address space, mapped

https://worldip.io/

9•theanonymousone•2h ago•4 comments

Proliferate (YC S25) is hiring to building open source Codex

https://www.ycombinator.com/companies/proliferate/jobs/L3copvK-founding-engineer

1•pablo24602•3h ago

Show HN: Lathe – Use LLMs to learn a new domain, not skip past it

https://github.com/devenjarvis/lathe

170•devenjarvis•9h ago•36 comments

Backrest – a web UI and orchestrator for restic backup

https://github.com/garethgeorge/backrest

49•flexagoon•5d ago•3 comments

Anthropic, please ship an official Claude Desktop for Linux

https://github.com/anthropics/claude-code/issues/65697

367•predkambrij•7h ago•203 comments

Podman 6: machine usability improvements (2025)

https://blog.podman.io/2025/10/podman-6-machine-usability-improvements/

76•daesorin•6h ago•5 comments

Why isn't the U.S. better at soccer?

https://www.natesilver.net/p/why-isnt-the-us-better-at-soccer

17•7777777phil•37m ago•11 comments

A visual introduction to kernel functions

https://kelvinpaschal.com/blog/kernel-functions/

7•Kelvinidan•2d ago•0 comments

Win16 Memory Management

http://www.os2museum.com/wp/win16-memory-management/

122•supermatou•2d ago•59 comments

There's no escaping it: an exploration of ANSI codes

https://blog.safia.rocks/2025/12/22/ansi-codes/

22•ankitg12•2d ago•7 comments

Public Domain Image Archive

https://pdimagearchive.org/

225•davidbarker•19h ago•31 comments

sqlite: A CGo-free port of SQLite/SQLite3

https://gitlab.com/cznic/sqlite

25•tosh•6h ago•13 comments

The Secret Life of Circuits with lcamtuf / Michał Zalewski (Audio Interview)

https://theamphour.com/725-the-secret-life-of-circuits-with-lcamtuf-michal-zalewski/

56•ChrisGammell•3d ago•5 comments

The curious case of low-protein diets

https://knowablemagazine.org/content/article/living-world/2026/low-protein-diet-animals-live-longer

24•curmudgeon22•1h ago•9 comments

Vitamin D3 During Pregnancy and Cognitive Performance at 10 Years

https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2849122

175•supermatou•5h ago•76 comments

Show HN: Kyushu – A self-hostable WASM sandbox for JavaScript workers

https://kyushu.dev/

66•le_chuck•12h ago•24 comments

Speculative KV coding: losslessly compressing KV cache by up to ~4×

https://fergusfinn.com/blog/kv-entropy-coder/

128•kkm•3d ago•28 comments

Symbolica 2.0: Programmable Symbols for Python and Rust

https://symbolica.io/posts/symbolica_2_0_release/

140•mmastrac•2d ago•12 comments

Valve P2P networking broken for more than 2 months

https://github.com/ValveSoftware/GameNetworkingSockets/issues/398

255•babuskov•16h ago•124 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.