A new puzzle every Saturday. Solutions one week later.

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1061 weeks, 1094 pages & 7427 days
20 years + 3 months + 30 days

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Puzzle of the week

Coll.20th-018. Prime repunits as sum of consecutive primes

Curios by CR in Prime Curios!


The last five news

Date Puzzle about


Set-21-18 Coll.20th-012 Tognon Stefano
Set-14-18 Coll.20th-011



Jan vand Delden

Carlos Rivera

John Arioni

Set-7-18 Coll.20th-015 Jeff Heleen, Claudio Meller and Emmanuel Vantieghem
Aug-31-18 Coll.20th-013

Puzzle 32

Jan van Delden, John Arioni

Carlos Rivera

Ago-24-18 Coll.20th-013 John Arioni


These pages will be updated every Saturday morning -- Last Modified on: September 1, 2018

"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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