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Compiling Ruby to Machine Language

https://patshaughnessy.net/2025/11/17/compiling-ruby-to-machine-language
50•todsacerdoti•1h ago•1 comments

Show HN: I built a synth for my daughter

https://bitsnpieces.dev/posts/a-synth-for-my-daughter/
787•random_moonwalk•5d ago•149 comments

Show HN: PrinceJS – 19,200 req/s Bun framework in 2.8 kB (built by a 13yo)

https://princejs.vercel.app
52•lilprince1218•1h ago•20 comments

"One Student One Chip" Course Homepage

https://ysyx.oscc.cc/docs/en/
41•camel-cdr•5d ago•9 comments

Project Gemini

https://geminiprotocol.net/
149•andsoitis•5h ago•87 comments

My stages of learning to be a socially normal person

https://sashachapin.substack.com/p/my-six-stages-of-learning-to-be-a
166•eatitraw•2d ago•66 comments

FreeMDU: Open-source Miele appliance diagnostic tools

https://github.com/medusalix/FreeMDU
202•Medusalix•7h ago•49 comments

Show HN: ESPectre – Motion detection based on Wi-Fi spectre analysis

https://github.com/francescopace/espectre
52•francescopace•6h ago•7 comments

An official atlas of North Korea

https://www.cartographerstale.com/p/an-official-atlas-of-north-korea
124•speckx•3h ago•68 comments

WeatherNext 2: Our most advanced weather forecasting model

https://blog.google/technology/google-deepmind/weathernext-2/
128•meetpateltech•6h ago•50 comments

Israeli-founded app preloaded on Samsung phones is attracting controversy

https://www.sammobile.com/news/israeli-app-app-cloud-samsung-phones-controversy/
236•croes•4h ago•151 comments

Show HN: Continuous Claude – run Claude Code in a loop

https://github.com/AnandChowdhary/continuous-claude
29•anandchowdhary•2d ago•12 comments

Our dogs' diversity can be traced back to the Stone Age

https://www.bbc.com/news/articles/ce9d7j89ykro
19•1659447091•3d ago•6 comments

Insects on the Space Menu

https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/Insects_on_the_space_menu
5•ohjeez•5d ago•0 comments

Aldous Huxley predicts Adderall and champions alternative therapies

https://angadh.com/inkhaven-7
22•surprisetalk•6h ago•7 comments

Astrophotographer snaps skydiver falling in front of the sun

https://www.iflscience.com/the-fall-of-icarus-you-have-never-seen-an-astrophotography-picture-lik...
123•doener•1d ago•27 comments

How to escape the Linux networking stack

https://blog.cloudflare.com/so-long-and-thanks-for-all-the-fish-how-to-escape-the-linux-networkin...
56•meysamazad•5h ago•5 comments

How when AWS was down, we were not

https://authress.io/knowledge-base/articles/2025/11/01/how-we-prevent-aws-downtime-impacts
46•mooreds•4h ago•23 comments

Giving C a superpower: custom header file (safe_c.h)

https://hwisnu.bearblog.dev/giving-c-a-superpower-custom-header-file-safe_ch/
215•mithcs•10h ago•172 comments

EEG-based neurofeedback in athletes and non-athletes

https://www.mdpi.com/2306-5354/12/11/1202
17•PaulHoule•3h ago•2 comments

A graph explorer of the Epstein emails

https://epstein-doc-explorer-1.onrender.com/
130•cratermoon•2d ago•16 comments

The time has finally come for geothermal energy

https://www.newyorker.com/magazine/2025/11/24/why-the-time-has-finally-come-for-geothermal-energy
61•riordan•7h ago•118 comments

Show HN: Building WebSocket in Apache Iggy with Io_uring and Completion Based IO

https://iggy.apache.org/blogs/2025/11/17/websocket-io-uring/
13•spetz•3h ago•2 comments

Where do the children play?

https://unpublishablepapers.substack.com/p/where-do-the-children-play
254•casca•1d ago•200 comments

DESI's Dizzying Results

https://www.universetoday.com/articles/desis-dizzying-results
14•belter•3h ago•2 comments

Google is killing the open web, part 2

https://wok.oblomov.eu/tecnologia/google-killing-open-web-2/
284•akagusu•5h ago•234 comments

Are you stuck in movie logic?

https://usefulfictions.substack.com/p/are-you-stuck-in-movie-logic
131•eatitraw•9h ago•117 comments

Replicate is joining Cloudflare

https://replicate.com/blog/replicate-cloudflare
239•bfirsh•7h ago•54 comments

People are using iPad OS features on their iPhones

https://idevicecentral.com/ios-customization/how-to-enable-ipad-features-like-multitasking-stage-...
96•K0IN•18h ago•110 comments

An overly aggressive mock can work fine, but break much later

https://nedbatchelder.com/blog/202511/why_your_mock_breaks_later.html
50•ingve•22h ago•51 comments
Open in hackernews

Right-Truncatable Prime Counter

https://github.com/EbodShojaei/Right-Truncatable-Primes
9•rainmans•5mo ago

Comments

throwawaymaths•5mo 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•5mo ago
i dont think smaller radixes make the problem more interesting. the problem is interesting because base 10 has a large branching factor
throwawaymaths•5mo 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•5mo ago
There's a Project Euler problem for finding truncatable prime numbers, from both left and right: https://projecteuler.net/problem=37
thechao•5mo 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.