Sequence and first differences together list all positive numbers exactly once(oeis.org)

71 points by andersource 1 year ago | 25 comments

Project Euler(projecteuler.net)

518 points by swatson741 11 months ago | 126 comments

The About page of Project Euler, a site offering a series of challenging mathematical and computer programming problems for recreational learning.

Powers of 2 with all even digits(oeis.org)

238 points by Hbruz0 1 year ago | 107 comments

Show HN: I wished for a site with a growing list of math problems, I built it(teachyourselfmath.app)

323 points by viveknathani_ 2 years ago | 80 comments

teachyourselfmath is a site listing a growing feed of math problems extracted from PDFs and textbooks, filterable by topic with discussion threads.

Computation of the n'th digit of pi in any base in O(n^2) (1997)(bellard.org)

55 points by akkartik 3 years ago | 29 comments

Open Problems in Computational geometry(topp.openproblem.net)

80 points by nill0 1 year ago | 12 comments