A new puzzle every Saturday. Solutions one week later.


Basic Stats
1048 weeks, 1081 pages & 7336 days
20 years + 1 months +0 days

>>>>Puzzlers Statistics<<<<


Puzzle of the week

Coll.20th-005. Questions about the function sigma(x)=n.


Curios by CR in Prime Curios!


The last five news

Date Puzzle about


Jun-22-18 Coll.20th-003


Dmitry Kamenetsky, Michael Hürter.

Emmanuel Vantieghem

Jun-15-18 Coll.20th-003 Claudio Meller, Michael Hürter, Emmanuel Vantieghem and Dmitry Kamenetsky.
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: Friday, 22-Jun-2018 13:57:10 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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