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 Forum index » PEN Problems » C. Primes and Composite Numbers
C. Primes and Composite Numbers
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[DfAk, pp. 50] Leningrad Mathematical Olympiad 1991
  Peter    4    2925    Wed Feb 27, 2013 10:43 am 
jordan View latest post
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IMO 2001/6
  Peter    3    2404    Wed Mar 07, 2007 1:34 pm 
The soul of rock View latest post
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MM, Problem Q614, Rod Cooper
  Peter    3    1946    Mon Dec 24, 2012 1:15 am 
jordan View latest post
 No new posts Note 4     Peter    7    2470    Wed Feb 27, 2013 10:20 am 
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IMO Short List 1992 P16
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Kouichi Nakagawa View latest post
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MM, Problem Q684, Noam Elkies
  Peter    8    3259    Mon May 12, 2008 2:33 am 
t0rajir0u View latest post
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USA 1982
  Peter    3    2173    Mon May 05, 2008 11:34 pm 
t0rajir0u View latest post
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[VsAs]
  Peter    9    2505    Thu Jan 29, 2009 7:31 am 
hxy09 View latest post
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IMO Short List 1996 N1
  Peter    2    1717    Mon May 05, 2008 11:37 pm 
bboypa View latest post
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[DfAk, pp. 9] Leningrad Mathematical Olympiad 1987
  Peter    4    2189    Tue Apr 15, 2008 6:03 am 
me@home View latest post
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[JDS, pp. 26]
  Peter    2    1518    Sun Aug 30, 2009 10:37 pm 
shoki View latest post
 No new posts Note 12     Peter    6    2295    Sat Oct 03, 2009 10:22 am 
coquitao View latest post
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IMO Short List 1990 USS1
  Peter    3    1884    Fri Nov 09, 2007 10:35 pm 
maxal View latest post
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[Tma, pp. 101]
  Peter    7    2638    Tue Apr 29, 2008 10:12 pm 
bozzball View latest post
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MM, Problem Q789, Norman Schaumberger
  Peter    10    3202    Fri Dec 21, 2007 11:35 pm 
fedja View latest post
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MM, Problem 1392, George Andrews
  Peter    1    2179    Tue Mar 27, 2007 8:47 pm 
darij grinberg View latest post
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[AaJc pp.212]
  Peter    5    2254    Wed Apr 30, 2008 12:25 pm 
bozzball View latest post
 No new posts Note 18     Peter    2    1608    Wed Mar 27, 2013 4:21 pm 
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[AaJc pp.176]
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BanziC View latest post
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[GjJj pp.140]
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ZetaX View latest post
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[Ns pp.176]
  Peter    3    1748    Tue Feb 26, 2008 12:42 am 
ZetaX View latest post
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IMO 2003/6
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Yimin Ge View latest post
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Yugoslavia 2001
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Winged Potato View latest post
 No new posts Note 24     Peter    10    3337    Fri Oct 26, 2007 1:50 pm 
Peter View latest post
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IMO 1989/5
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shoki View latest post
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[GjJj pp.36]
  Peter    3    1769    Fri Jun 13, 2008 11:51 pm 
ZetaX View latest post
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[Tma, pp. 102]
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ywl View latest post
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[Tma, pp. 128]
  Peter    1    1431    Wed Sep 19, 2007 12:27 am 
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Singapore 1989
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Russia 1996
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[Rh, pp. 43]
  Peter    5    1990    Wed Apr 30, 2008 9:53 pm 
Peter View latest post
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[Tt] Tournament of the Towns 2001 Fall/O-Level
  Peter    1    1491    Sat Feb 24, 2007 8:54 pm 
ZetaX View latest post
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[PeJs, pp. 160], S. Golomb
  Peter    3    1771    Fri Dec 14, 2007 10:15 pm 
ZetaX View latest post
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[PeJs, pp. 174]
  Peter    3    1711    Fri Dec 14, 2007 10:14 pm 
ZetaX View latest post
 No new posts Note 35  
[DNI, 19]
  Peter    2    1589    Wed Feb 27, 2013 11:10 am 
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