Alternatives
Products that do what 2025 = sum(I^3) for I = 0..9 does
This year's number is kinda fun: 2025 = 0^3 + 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3 Which is equivalent to: 2025 = (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9) ^ 2 = 45 ^ 2 Next time this will happen is 1000 years from now, in 3025. See y'all then!
- 1A4
It's a a long puzzle, somewhat akin to a 2000 piece jigsaw puzzle. Solving it collectively with others is encouraged. If you are the sort that likes rules, the rules are you can use Google or whatever external sources you like for help. View page source, however, is cheating. Hat tip to Octagon and the TND crew for help in play testing and proposing categories.
Dec 2025 · thomaswc.com
- 2IM
I've been studying interval arithmetic for the past few weeks and it's a really interesting field because while there is a ton of super interesting research published over the past decades, it has never really gotten the recognition that it deserves, IMO. One reason for this is that standard interval arithmetic has really poor handling of division by intervals containing zero. If you compute 1 / [-1, 2] in regular interval arithmetic, you get either [-∞, +∞], or you have to say that the operation is undefined. Both solutions are virtually useless. The real answer of course is [-∞, -1] U…
Apr 2026 · victorpoughon.github.io
- 3
Scroll through all 43,252,003,274,489,856,000 reachable Rubik's Cube permutations.
27d ago · everycube.alen.is
- 4MO
2017 · mathcha.io
- 5AN
2018 · github.com
- 6MA
2017 · play.google.com
- 7TA
Credit goes to the contributors of https://github.com/enjeck/num2math for making the tool's core.
2024 · scientific.place
- 8LN
I was reviewing Dirac's Large Numbers Hypothesis (https://en.wikipedia.org/wiki/Dirac_large_numbers_hypothesis) and decided to give it a second go, now with measurements of fundamental constants more precise than 100 years ago. And I stumbled upon a value for Hubble's constant that's uncannily close. Here are the full calculations. https://colab.research.google.com/drive/1K1qoUFvqZp1fWbpcKJWq63nflgwS0ZHh?usp=sharing Meaningless, or meaningful coincidence?
2021
- 9GC
Achieved a new world record in verifying the Goldbach Conjecture using grid computing, by extending the verification up to 4 quadrillion (4×10¹⁸) + 70 trillion (7×10¹³). My grid computing system - Gridbach is a cloud-based distributed computing system accessible from any PC or smartphone. It requires no login or app installation. The high-performance WASM (WebAssembly) binary code is downloaded as browser content, enabling computation on the user’s browser. [Website] https://gridbach.com/ [Medium]…
2025 · medium.com
- 10IM
Hey, maker here. After launching a daily word search game, I randomly thought of this math game while driving. Finally got around to making it and I think it turned out pretty cool. It’s a math search game that’s meant to help you practice your quick addition, subtraction, multiplication, and division skills. I’m hoping it’ll help people (even those like me who aren’t big on math) learn and increase their speeds. (There are also some settings you can enable to make the game harder) If you try it out, please let me know if you found it fun, if you have anything you’d like me to add, or if you…
2024 · worchle.com
- 11IM
I've been playing with this for quite some time and I think it's finally ready for public consumption. All feedback welcome.
2025 · madmonk13.github.io
- 12
- 13
- 14TK
I analyzed two orderings of the 64 I Ching hexagrams and found the permutation cycle decomposition between them is [52, 10, 2] with zero fixed points. Nobody has done this kind of analysis before and this cycle type has not been reported in the literature. You can verify it yourself.
Mar 2026 · gzw1987-bit.github.io
- 15
- 16SA
2024 · github.com
- 17IG
I’ve always found that online calculators tend to have bad UIs, especially on mobile. Most of the calculator websites I’ve come across use outdated and inconvenient ways of inputting data, or they format the results in confusing ways. I’ve noticed that fraction calculators (especially mixed fractions) are terrible to use, even on desktop. I haven’t built one of those yet, but it’s something I’m planning to tackle soon. This is a project I’ve always wanted to work on, but I’m relatively new to this space. So far, I’ve created a collection of simple calculators focused on math and finance. I’d…
2025
- 18BA
2020 · andrewsun.com
- 19IG
Here's a video of it in action https://twitter.com/i/status/1667355251773526016 I didn't end up using it that much back then and no one else seems to have cared it existed, but it was a project I used to derust my programming skills and I'm to this day proud of the flamboyant design. To anyone reading this: you don't have to let your old code rot away in the graveyard of distant memories just because times change. With enough persistence and a little perseverance anything is possible. Code doesn't have an expiration date. -day
2023 · github.com
- 20
Open-source framework for cryptography & data analysis
May 2026 · github.com
- 21MI
Hi HN! I had a math idea whose thread I've been pulling on, and ended up creating this concept of Space Numbers. To read about it, see the pdf at the linked repo: https://github.com/abidsikder/space-numbers I'd appreciate feedback and ideas about the concepts, as well as further mathematical topics to take a look at that might be related, thank you all!!
2024 · github.com
- 22DA
Hello HN! We're Rory and Chris, and we've made a game called Dozenal[0], a grid-based number puzzle game where the objective is to use all the tiles on the board to create totals of 12 (hence the name). We think the mechanic is quite unique, although keen to hear if people know of similar games! You essentially drag tiles across the board, and the distance between two numbers decides the arithmetic operation when they connect to each other: zero spaces is addition, one space is subtraction, two spaces is multiplication: e.g. 5 → 4 = 9 5 → _ → 4 = 1 5 → _ → _ → 4 = 20 We've spent the past…
Jul 2026 · dozenal.game
- 23MY
A fun little game idea I had last year after building a personal kb based bit manipulator to have a better sense of the binary space. All sounds and graphics are my own.
2025 · 24bitsa.day
- 24
Ranked by how close each launch is in meaning, then by votes. Refine with a description →