Project Euler(projecteuler.net)
518 points by swatson741 | 126 comments
The About page of Project Euler, a site offering a series of challenging mathematical and computer programming problems for recreational learning.
#math-puzzles on Hacker News
4 stories tagged math-puzzles, newest first.
Finding Shawn Mendes (2019)(ericneyman.wordpress.com)
362 points by jzwinck | 53 comments
Eric Neyman's 2019 blog post "Finding Shawn Mendes" on his math and puzzles blog Unexpected Values, filed under "100% Serious."
Making any integer with four 2s(eli.thegreenplace.net)
338 points by LorenDB | 144 comments
Eli Bendersky's blog post on the puzzle of generating any natural number using exactly four 2s and arbitrary mathematical operations.
Halfsies(brilliant.org)
443 points by hysan | 133 comments
A Brilliant.org challenge page titled "Halfsies"; the page failed to render and showed no content.