A new puzzle every Saturday. Solutions one week later.

>>>>Basic Stats<<<<
1134 weeks, 1166 pages & 7978 days
21 years + 8 month + 23 days

>>>>Puzzlers Statistics<<<<
(updated on Feb 28 2019)

Our dear friend Farideh Firoozbakht passed away on Dec 24, 2019.
See more details in her short bio page.
Note published on Jan 11, 2020

Puzzle of the week

Puzzle 990. K n-values in AP with the same sigma(n)

Curios by CR in Prime Curios!
(updated on Feb 28 2019)

The last five news

Date Puzzle about


Feb-14-20 Puzzle 989


Puzle 79

Paul Leary, Giovanni Resta, Emmanuel Vantieghem, Oscar Volpatti

Arkadiusz Wesolowski

Feb-07-2020 Puzzle 988

Puzzle 986

Puzzle 841

Michael Hürter nd Dmitry Kamenetsky

Gennady Gusev and Mark Mammel

Natalia Makarova

Jan-31-2020 Puzzle 987

Puzzle 782

Puzzle 986

Carlos Rivera, Oscar Volpatti and Emmanuel Vantieghem

Giovanni Resta

Paul Cleary and Mark Mammel

Jan-24-20 Puzzle 986 Gennady Gusev
Jan-17-20 Puzzle 985 Giovanni Resta, Adam Stinchcombe, Jan van Delden


These pages will be updated every Saturday morning -- Last Modified on: Friday, 14-Feb-2020 14:58:55 MST

"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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