A new puzzle every Saturday. Solutions one week later.

***Special invitation to the Collection-20th***
In order to celebrate our 20th anniversary I will accept at least 20 new prime-puzzles, one per puzzler, to be published here starting the next May 26.
I would expect these puzzles shine because of its novelty, ingenuity, difficulty or just beauty.
Please start sending your puzzle-proposal since now on!
3/10/18, and do not stop if the sent puzzle proposal arrive or exceed 20 puzzles. We may accept more, of course!!!

Puzzles received and accepted for the Collection-20th: 19
 (up to 4/20/18).

1039 weeks, 1072 pages & 7273 days
19 years + 10 months +29 days

Puzzle 922. Follow up to Puzzle 634

The last five news

Date Puzzle about


April-13-19 Puzzle 920  Walter Trump, Jan van Delden and Emmanuel Vantieghem
April-6-18 Puzzle 919 Jan van Delden and Giovanni Resta
March-30-18 Puzzle 918 Jan van Delden, Jeff Heleen,  Emmanuel Vantieghem, Giovanni Resta
March-23-18 Puzzle 917 Flavio Torasso
March-16-18 Puzzle 916 Emmanuel Vantieghem.


[an error occurred while processing this directive]

These pages will be updated every Saturday morning -- Last Modified on: Friday, 20-Apr-2018 14:39:45 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 "

Copyright 1998-2012: Design by: LANDOIS