The Prime Puzzles & Problems Connection, by Carlos Rivera

A new puzzle every Saturday. Solutions one week later.

>>>>Basic Stats<<<<
April-25-2026
1457 weeks, 1488 pages & 10199 days
27 years 11 Months 3 days
Since May 23 1998

Puzzle of the week

Conjecture 111. The density approaches at the constant 1/e^2.

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

Latest ten news
No.	Date	Puzzle about	Solvers
10	Apr-24-26	Puzzle 20 Problem 92 Puzzle 14 Personal Page	Serge Batalov (a BIG! record for Emirps) Arkadiusz Wesolowski Patick De Geest (He found the fifth palprime known of the form {n^2+(n+1)^2}) Carlos Rivera, updated his personal page.
9	Apr-17-26	Puzzle 1265 Puzzle 1143	J. M. Rbert, Jeff Heleen, Emmanuel Vantiegehm, Gennady Gusev, Paul Cleary, Simon Cavegn, Oscar Volpatti Ashaz Jameel
8	Apr-10-26	Puzzle 899 Puzzle 1264	Arkadiusz Wesoloski. He got a near-miss to break a supposed limit that hasn't been proved yet. Simon Cavegn
7	Apr-3-26	Puzzle 1263 Puzzle 1254 Puxzle 121 Puzzle 20	Ashaz Jameel. Mike Keith through G. L. Honaker, Jr. Gennady Gusev Ashaz Jameel
6	March-27-2026	Puzzle 1263 Puzzle 1262 Puzzle 1143	Michael Branicky, Carlos Rivera, Gennady Gusev, Emmanuel Vantieghem Ashaz Jameel Carlos Rivera
5	March-20-26	Puzzle 1262 Puzzle 20	Michael Branicky, Paul Cleary, Gennady Gusev, Giorgios Kalogeropoulos, Emmanuel Vantieghem, Ankit Chakraborty Simon Cavegn, reports about more emirps records, for this page.
4	March-13-26	Puzzle 1261	Emmanuel Vantieghem, Jeff Heleen, Michael Branicky, J. M. Rebert, Paul Cleary, Ankit Chakraborty, Gennady Gusev
3	March-6-26	Puzzle 1260 Puzzle 20	Rahid Zaman, Gennady Gusev Stephan Schöler, found a new record EMIRP, of 10011 digits, four more digits than the previous record by J. K. Andersen, from 2007.
2	Feb-27-26	Puzzle 1259 Conjecture 109 Problem 89 Puzzle 50 Puzzle 1223	Emmanuel Vantieghem, Carlos Rivera, Sebastián Martín Ruiz, Ashaz Jameel M. F. Hasler via S. M. Ruiz Ashaz Jameel Mike Keith Rahid Zaman
1	Feb-20-26	Puzzle 1258 Puzzle 878	Michael Branicky, Gennady Gusev, Jeff Heleen, Rahid Zaman, Emmanuel Vantieghem and Ankit Chakraborty. Bruno Mishutka

These pages will be updated every Saturday morning -- Last Modified on: Friday, 24-Apr-2026 15:58:24 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 "