A new puzzle every Saturday. Solutions one week later.

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1189 weeks, 1219 pages & 8323 days
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>>>>Puzzlers Statistics<<<<
(updated on Feb 28 2019)

Puzzle of the week

Puzzle 1031. Rigidly-deletable primes again

Curios by CR in Prime Curios!
(updated on July 4, 2020)

Latest ten news


Date Puzzle about


10 Mar-5-21 Conjecture 30 J. Feliksiak
9 Feb-27-21 Puzzle 1030

Conjecture 30

Oscar Volpatti, Emmanuel Vantieghem and Paul Cleary

Jan Riemann

8 Feb-20-21 Problem 81 Simon Cavegn, Paul Cleary
7 Feb-13-21 Problem 59

Puzzle 65

Simon Cavegn

Adam Stinchcombe

6 Feb-06-21 Puzzle 1029

Puzzle 178

Oscar Volpatti, Simon Cavegn.

Richard Chen

5 Jan-29-21 Puzzle 17

Puzzle 65

Puzzle 178

Conjecture 87

Dana Jacobsem

Adam Stinchcombe

Richard Chen

Dmitry Kamenetsky, Giorgos Kalogeropoulos, Oscar Volpatti, Simon Cavegn

4 Jan-22-21 Puzzle 1028 Dmitry Kamenetsky, Adam Stinchcombe
3 Jan-15-21 Puzzle 1027 Emmanuel Vantieghem, Paul Cleary, Oscar Volpatti
2 Jan-8-21 Puzzle 1026


Problem 76

Emmanuel Vantieghem, Giorgos Kalogeropoulos, Michael Hürter, Oscar Volpatti, Paul Cleary, Fausto Morales-

1 Jan-1-21 Puzzle 1025


Problem 78

Emmanuel Vantieghem, Giorgos Kalogeropoulos, Oscar Volpatti, Jean-Marc REBERT, Paul Cleary, Simon Cavegn and Metin Sariyar.

G.L. Honaker, Jr.

  Dec 25-20 Puzzle 1024


Conjecture 86

Paul Cleary, Adam Stinchcombe, Oscar Volpatti, Jan van Delden, Giorgos Kalogeropoulos, Metin Sariyar, Simon Cavegn, Jeff Heleen

Alexei Kourbatov


These pages will be updated every Saturday morning -- Last Modified on: Friday, 05-Mar-2021 18:25:35 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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