A new puzzle every Saturday. Solutions one week later.

>>>>Basic Stats<<<<
Sep-5-2026
1476 weeks, 1507 pages & 10332 days
28 years 2 Months 12 days
Since May 23 1998

Puzzle of the week

Conjecture 113. A(n) = d + prime(n)#/d is prime.such that...

Curios by CR in Prime Curios!
(updated on April 30, 2021)

Latest ten news

No.

Date Puzzle about

Solvers

10 Sep-4-26 Puzzle 1281  Rahid Zaman, Michael Branicky, Giorgos Kalogeropoulos, Paul Cleary, Michael Hürter
9 Aug-28-26 See The Links page.



Puzzle
Coll20th-20


Problem 92
C. Rivera updates his two Calculators online:
CS Calculator V8 and 3NCS2.

Giorgos Kalogeropoulos/Rahid Zaman

Eric Brier
8 Aug-21-26 Puzle 1279 Arkadiusz Wesoloski, Carlos Rivera
7 Aug-14-26 Puzzle 1279

Problem 92
Emilia Gurisatti, Carlos Rivera

Emilia Gurisatti
6 Aug-7-2026 Puzzle 1278 Roberto Carlo Angelone
5 July-31-2026 Puzzle 1277 Paul Cleary, Michael Hürter, Giorgos Kalogeropoulos
4 July-24.2026 Puzzle 1276


Puzzle 1275
Ashaz Jameel, Paul Cleary, Oscar Volpatti, Giorgos Kalogeropoulos.

Ankit Chakraborty.

Carlos Rivera (about a new & larger Magic square, 19683x19683, sent by Roberto Carlos Angelone)
3 July-17-2026 Puzzle 1275

Puzzle 1002
Carlos Rivera

Rahid Zaman
2 July-10-26 Puzzle 1274




Puzzle 1273
Giorgos Kalogeropoulos, Emmanuel Vantieghem, Michael Branicky, Gennady Gusev, M. F. Hasler, Paul Cleary, Simon Cavegn

M. F. Hasler
1 July-3-2026 Puzzle 1273


Puzzle 1271
Michael Branicky, Paul Cleary, Roberto Angelone

Ashaz Jameel

 


These pages will be updated every Saturday morning -- Last Modified on: Friday, 04-Sep-2026 17:09:20 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 "

Copyright 1998-2012: Design by: LANDOIS