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DeepSeek search and fetch – $0.75 per 1000 successful requests

https://api-docs.deepseek.com/guides/search/
189•fagnerbrack•3h ago•89 comments

Show HN: Sphinx – A hook that quizzes you on your AI's code before shipping

https://sphinx-six-theta.vercel.app/
130•critiquebrowser•5h ago•33 comments

How the Elizabeth Holmes documentary “You Can See Everything” is deceiving

https://www.readtheprofile.com/p/elizabeth-holmes-documentary-you-can-see-everything
140•MaysonL•6h ago•143 comments

Bleached corals thrive within days when touching healthy neighbour

https://www.nature.com/articles/d41586-026-03266-x
458•alkyon•1d ago•99 comments

Lean now ships with verified kernels

https://leodemoura.github.io/blog/2026-10-15-lean-now-ships-with-verified-kernels/
137•matt_d•2d ago•47 comments

Teal – A statically-typed dialect of Lua

https://teal-language.org/
27•Lyngbakr•1d ago•6 comments

Go Piss, Girl: The plight of the public potty

https://thebaffler.com/latest/go-piss-girl-wagner
17•prismatic•1d ago•22 comments

Dam removals are bringing fish back across the northeastern United States

https://www.smithsonianmag.com/science-nature/dam-removals-are-bringing-fish-back-across-the-nort...
277•sohkamyung•1d ago•66 comments

DeepSeek-v4.1-Flash-1017

https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017
860•theykk•1d ago•655 comments

Pele – Mermaid diagrams as themeable SVG

https://pele.run/
439•dchest•18h ago•39 comments

Furifont, a Japanese font that shows furigana

https://furifont.antfu.me/
348•plaguna•3d ago•70 comments

Fun Extending the C Preprocessor

https://www.davidpriver.com/Fun-Extending-the-C-Preprocessor.html
27•david2ndaccount•2d ago•4 comments

Making chicken transparent using Dorito dust

https://chillphysicsenjoyer.substack.com/p/making-chicken-transparent-using
304•crescit_eundo•20h ago•81 comments

Southern ground hornbill gets 3D printed beak prostheses at Artis Zoo

https://nltimes.nl/2026/10/15/world-first-southern-ground-hornbill-gets-3d-printed-beak-prosthese...
31•jacquesm•2d ago•3 comments

The Commodore 64 hardware simulator: break chips and pins, see the results

https://github.com/antirez/c64-hw-simulator
189•antirez•3d ago•28 comments

Interactive Linear Programming in the Browser

https://lpviz.net/
34•klamike•22h ago•0 comments

Parser Combinators

https://t3.at/blog/2026-10-17-parser-combinators/
4•schindlabua•1h ago•0 comments

NY announces game ownership bill requiring ownership rather than licensing

https://www.tomshardware.com/video-games/new-york-rep-announces-game-ownership-bill-that-would-re...
292•guiambros•9h ago•105 comments

You could have invented transformers from memory

https://alexwang.ai/posts/associative-memory/
565•speckx•1d ago•127 comments

Matthew Prince on why Cloudflare offers a free version and always will (2016)

https://webmasters.stackexchange.com/questions/88659/how-can-cloudflare-offer-a-free-cdn-with-unl...
96•thatslast•5h ago•75 comments

Custom server to revive neato bots

https://github.com/vacuula/vacuula
47•matttah•3d ago•1 comments

Gold is now the top U.S. export

https://www.numismaticnews.net/gold-now-top-u-s-export
333•iamnothere•17h ago•182 comments

Show HN: High-quality duck audio synthesizer

https://celphase.github.io/duck-pond/
140•celphase•20h ago•30 comments

Codex Desktop continuously generates Crashpad pending dumps

https://github.com/openai/codex/issues/25921
133•AIorNot•16h ago•53 comments

Notes on the Complex Roots of Unity

https://eli.thegreenplace.net/2026/notes-on-the-complex-roots-of-unity/
26•sks_15•5h ago•3 comments

A Mole Infiltrated the Highest Ranks of American Militias (2025)

https://www.propublica.org/article/ap3-oath-keepers-militia-mole
91•georgecmu•5h ago•18 comments

Superoptimizing an FPU Emulator

https://purplesyringa.moe/blog/superoptimizing-an-fpu-emulator/
26•dverlaeckt80•1d ago•2 comments

Show HN: Llmspeed – feel how fast a local LLM runs before you buy the hardware

https://llmspeed.dev/
294•albinstman•1d ago•82 comments

Show HN: Esp32sim – Run ESP32 firmware in the browser

https://github.com/mikroverk/esp32sim
167•joakimeriksson•20h ago•32 comments

Solar surpasses nuclear power globally for first time

https://www.pv-magazine.com/2026/09/29/solar-surpasses-nuclear-power-globally-for-first-time/
612•xbmcuser•20h ago•380 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.