A new puzzle every Saturday. Solutions one week later.

***20th anniversary of Prime Puzzles***
In order to celebrate our 20th anniversary since may 26 2018, we start publishing the puzzles specially sent/collected for this purpose.

Currently we have received and approved around 25 puzzles. Until we publish the last one of these, we are open to receive other puzzles from new puzzlers supposed they satisfy the desired aim ("these puzzles shine because of its novelty, ingenuity, difficulty or just beauty") and setting a limit for this collection as a total of 54 puzzles.

Keep'em coming!


Basic Stats
1047 weeks, 1080 pages & 7329 days
20 years + 0 months +24 days

>>>>Puzzlers Statistics<<<<


Puzzle of the week

Coll.20th-004. Puzzles 104 & 385, revisited.


Curios by CR in Prime Curios!


The last five news

Date Puzzle about


Jun-15-18 Coll.20th-003 Claudio Meller, Michael Hürter, Emmanuel Vantieghem and Dmitry Kamenetski.
Jun-8-18 Coll.20th-002 Giovanni Resta, Simon Cavegn and Michael Hürter
Jun-1-18 Coll.20th-001 Emmanuel Vantieghem, Jan van Delden & Giovanni Resta.
May-25-18 Puzzle 926

Puzzle 655 and Puzzle 925

Problem 68

Emmanuel Vantieghem

Jan van Delden

Arkadiusz Wesolowski

May-18-18 Puzzle 925 Jan van Delden and Emmanuel Vantieghem


These pages will be updated every Saturday morning -- Last Modified on: Monday, 18-Jun-2018 11:07:44 PDT

"Many thanks to Martha Rivera, Miguel H. Rivera and  G. L. Honaker, Jr. for reviewing and correcting the  very first version of these pages, dated on May 23, 1998 "

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