20181108, 18:49  #1 
"Tilman Neumann"
Jan 2016
Germany
757_{8} Posts 
crossnumber #8
A challenging puzzle I found mentioned on https://blogs.ams.org/blogonmathblogs/ :
http://chalkdustmagazine.com/regular...mberissue08/ Last fiddled with by Till on 20181108 at 18:52 Reason: reference 
20181108, 21:16  #2  
"Forget I exist"
Jul 2009
Dumbassville
2^{6}×131 Posts 
Quote:
9D,36A,20D,3D,4D,22D,8D,26D,23A,5D, and 6D have to all be 2 mod 5 and 6 mod 7 ( so 27 mod 35) 21A is 257 16D and 3A both show 18A<72, if different 18A<69 1A is surrounded by numbers that only have 2's and 3's as factors because n^21=(n1)*(n+1) 

20181108, 22:42  #3  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3×11×157 Posts 
Quote:
Now lets hope I submitted the right sum 2 hints: 34A; Proth Numbers 14D: Triperfect number Last fiddled with by petrw1 on 20181108 at 22:51 

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