Secret operation
Public  2w:6d  6xp  Math  69.2% 
Find the digits in the following multiplication: * * * * * * * * * * * * * * *  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *  * * * * * * * * * * * * * * * Each star represents a prime number. There is only one solution. Answer format: 999999999999*999=999999999999999 [My timing: < 1m]
New Members
 Martinvom 6d:4h
 AnneLee 1w:4d
 Walker 1w:4d
 Stomach_ache 1w:4d
 czp001 1w:5d
Fresh Problems

Fair partition 2d:12h
solved by 7 
A mysterious machine 1w:2d
solved by 10 
Double mirror 2w:2d
solved by 5 
Secret operation 2w:6d
solved by 9 
Squarefree Factorisations 3w:2d
solved by 7