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 Forum index » PEN Problems » I. Combinatorial Number Theory
I. Combinatorial Number Theory
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 No new posts Note 1     Peter    3    1958    Tue Feb 27, 2007 3:21 am 
ZetaX View latest post
 No new posts Note 2  
Gauss
  Peter    7    2125    Sat Oct 03, 2009 1:25 pm 
mavropnevma View latest post
 No new posts Note 3  
MM, Problem 1376, Eric Canning
  Peter    3    1907    Fri Jul 04, 2008 7:34 pm 
Yimin Ge View latest post
 No new posts Note 4  
AMM, Problem 10837, Hojoo Lee
  Peter    1    1325    Sat Feb 24, 2007 8:20 pm 
ZetaX View latest post
 No new posts Note 5  
[Km, Problems Sheet 1-11]
  Peter    1    1257    Wed May 09, 2007 4:04 am 
Suchandan View latest post
 No new posts Note 6  
AMM, Problem 10626, Florian Luca
  Peter    3    1695    Fri Sep 25, 2009 9:26 pm 
cnyd View latest post
 No new posts Note 7  
[PeJs, pp. 237]
  Peter    1    1438    Sun Nov 25, 2007 11:31 pm 
maxal View latest post
 No new posts Note 8  
Russia 1998
  Peter    2    1763    Thu Dec 20, 2007 1:12 am 
Peter View latest post
 No new posts Note 9  
Canada 1999
  Peter    2    1486    Thu Jan 17, 2013 1:00 am 
jordan View latest post
 No new posts Note 10  
IMO 1998/3
  Peter    1    1239    Thu Aug 30, 2007 2:46 pm 
Peter View latest post
 No new posts Note 11  
IMO Short List 2000 N2
  Peter    2    1594    Thu Feb 26, 2009 11:50 pm 
bboypa View latest post
 No new posts Note 12  
Canada 1992
  Peter    1    1191    Sun Jul 22, 2007 3:10 am 
Peter View latest post
 No new posts Note 13  
IMO Short List 1983 (Belgium)
  Peter    1    1346    Sun Jul 22, 2007 3:11 am 
Peter View latest post
 No new posts Note 14  
[Rh pp.104] Quantum, Problem M59, B. Martynov
  Peter    1    1246    Sun Jul 22, 2007 3:11 am 
Peter View latest post
 No new posts Note 15  
[PeJs, pp. 237]
  Peter    1    1287    Sun Nov 25, 2007 11:36 pm 
maxal View latest post
 No new posts Note 16  
[PeJs, pp. 237]
  Peter    1    1307    Tue Feb 27, 2007 4:37 am 
ZetaX View latest post
 No new posts Note 17  
[Jjt, pp. 95]
  Peter    1    1238    Sun Oct 21, 2007 2:42 am 
TTsphn View latest post
 No new posts Note 18  
[Dmb, pp. 108]
  Peter    1    1193    Sun Jul 22, 2007 3:13 am 
Peter View latest post
 No new posts Note 19  
Belarus 1999, D. Bazylev
  Peter    2    1461    Sat Oct 31, 2009 2:00 am 
Joao Pedro Santos View latest post
 No new posts Note 20  
(Erd\"os) [Rh2, pp. 243]
  Peter    8    3456    Sun Feb 15, 2009 3:41 pm 
Erken View latest post
 No new posts Note 21  
IMO Long List 1985 (PL2)
  Peter    6    1973    Sat Jun 13, 2009 2:22 am 
math10 View latest post
 No new posts Note 22  
IMO 1971/3
  Peter    2    1267    Thu Jan 14, 2010 5:45 am 
Moonmathpi496 View latest post
 No new posts Note 23  
Berkeley Math Circle Monthly Contest 1999-2000
  Peter    2    1406    Sun Apr 26, 2009 7:50 am 
hxy09 View latest post
 No new posts Note 24  
India 1998
  Peter    2    1428    Fri Oct 26, 2007 10:00 am 
TTsphn View latest post
 No new posts Note 25  
USA 2001
  Peter    1    1356    Sat Oct 27, 2007 3:03 pm 
freemind View latest post
 No new posts Note 26  
USA 1998
  Peter    2    1415    Fri Oct 26, 2007 2:03 pm 
TTsphn View latest post
 No new posts Note 27  
Romania 1998
  Peter    1    1231    Sun Sep 23, 2007 7:58 pm 
rem View latest post
 No new posts Note 28  
India 2000
  Peter    2    1461    Fri Oct 23, 2009 8:46 am 
kamil9876 View latest post
 No new posts Note 29  
Romania 1998
  Peter    1    1260    Tue Apr 21, 2009 2:01 pm 
Johan Gunardi View latest post
 No new posts Note 30  
IMO 1991/3
  Peter    1    1226    Sun Oct 21, 2007 7:50 am 
chien than View latest post
 No new posts Note 31  
MM, Problem 1466, David M. Bloom
  Peter    5    1571    Sat May 09, 2009 11:27 am 
hxy09 View latest post
 No new posts Note 32  
IMO 1985/2
  Peter    1    1254    Mon Feb 26, 2007 12:48 am 
ZetaX View latest post
 No new posts Note 33  
Romania 1997, Marian Andronache and Ion Savu
  Peter    4    1702    Sat Feb 24, 2007 10:18 pm 
Peter View latest post
 No new posts Note 34  
IMO 1983/5
  Peter    1    1054    Sat Feb 24, 2007 6:04 pm 
Peter View latest post
 No new posts Note 35  
IMO Short List 2001
  Peter    1    1152    Tue Sep 25, 2007 9:31 pm 
rem View latest post
 No new posts Note 36  
Turkey 1996
  Peter    1    1304    Fri Oct 05, 2007 4:43 pm 
freemind View latest post
 No new posts Note 37  
IMO 1995/6
  Peter    1    1058    Fri Feb 23, 2007 11:33 pm 
ZetaX View latest post
 No new posts Note 38  
IMO Short List 2002 N5
  Peter    3    1719    Wed Jan 07, 2009 5:11 pm 
greentreeroad View latest post
 No new posts Note 39  
IMO Short List 1998 P16
  Peter    1    1132    Sun Oct 21, 2007 9:49 am 
chien than View latest post
 No new posts Note 40  
IMO Short List 1998 P17
  Peter    1    1093    Sun Oct 21, 2007 9:52 am 
chien than View latest post
 No new posts Note 41  
IMO ShortList 1998 P20
  Peter    1    1141    Sun Oct 21, 2007 9:57 am 
chien than View latest post
 No new posts Note 42  
IMO Short List 1996
  Peter    1    1092    Tue Aug 03, 2010 2:00 pm 
kamil9876 View latest post
 No new posts Note 43  
[TaZf pp.10] High-School Mathematics (China) 1994/1
  Peter    4    1706    Fri May 01, 2009 8:28 am 
hxy09 View latest post
 No new posts Note 44  
IMO Short List 2002 A6
  Peter    2    1232    Sat Apr 25, 2009 3:58 pm 
hxy09 View latest post
 No new posts Note 45  
IMO Short List 2001 C4
  Peter    4    1694    Tue May 06, 2008 7:04 pm 
tjhance View latest post
 No new posts Note 46  
IMO Short List 2000 C6
  Peter    5    1624    Thu Dec 18, 2008 12:26 am 
Peter View latest post
 No new posts Note 47  
IMO Short List 1999 A4
  Peter    1    1043    Sun Mar 30, 2008 6:35 pm 
SimonM View latest post
 No new posts Note 48  
IMO Short List 1999 C4
  Peter    2    1252    Sat May 02, 2009 8:56 am 
hxy09 View latest post
 No new posts Note 49  
Australia 2002
  Peter    3    1442    Tue Apr 01, 2008 4:12 am 
Valentin Vornicu View latest post
 No new posts Note 50  
[Ae pp.228]
  Peter    1    1059    Sat Feb 24, 2007 6:34 pm 
e.lopes View latest post
 No new posts Note 51  
IMO ShortList 1991 P24 (IND 2)
  Peter    2    1207    Sun Jun 07, 2009 4:31 am 
hxy09 View latest post
 No new posts Note 52  
IMO Short List 1990 CZE2
  Peter    2    1006    Wed Dec 09, 2009 11:11 am 
kamil9876 View latest post
 No new posts Note 53  
IMO Short List 1990 MEX2
  Peter    1    1086    Tue Nov 06, 2007 6:16 pm 
mszew View latest post
 No new posts Note 54  
Romania TST 1998
  Peter    1    1251    Sat Jul 18, 2009 7:44 am 
freemind View latest post
 No new posts Note 55  
IMO Short List 1995
  Peter    1    1350    Mon Nov 19, 2007 6:31 pm 
freemind View latest post
 No new posts Note 56  
IMO Short List 1999
  Peter    1    1188    Wed Sep 26, 2007 11:11 pm 
rem View latest post
 No new posts Note 57  
IMO Short List 1999
  Peter    1    1182    Wed May 07, 2008 9:00 pm 
tjhance View latest post
 No new posts Note 58  
Romania 1995
  Peter    2    1319    Fri Nov 16, 2007 2:44 pm 
Peter View latest post
 No new posts Note 59  
Japan 1990
  Peter    2    1286    Sun May 24, 2009 7:38 am 
hxy09 View latest post
 No new posts Note 60  
USA 2003
  Peter    1    1168    Sat Sep 22, 2007 12:04 am 
rem View latest post
 No new posts Note 61  
Putnam 1997/A5
  Peter    1    1135    Tue Oct 16, 2007 6:49 pm 
Peter View latest post
 No new posts Note 62  
British Mathematical Olympiad 2000
  Peter    8    2609    Sat Jun 21, 2008 12:52 pm 
Erken View latest post
 No new posts Note 63  
Bulgaria 2003
  Peter    1    1220    Tue Oct 09, 2007 6:38 pm 
freemind View latest post
 No new posts Note 64  
IMO 1970/4
  Peter    1    1166    Fri Aug 10, 2007 1:37 am 
diophantient View latest post
 No new posts Note 65  
CRUX, Problem A233, Mohammed Aassila
  Peter    1    1105    Sat Feb 24, 2007 6:04 pm 
e.lopes View latest post
 No new posts Note 66  
[KhKw, pp. 12]
  Peter    1    1056    Mon Oct 15, 2007 11:35 pm 
Peter View latest post
 No new posts Note 67  
(D. Fomin) [Ams, pp. 12]
  Peter    1    1380    Mon Oct 15, 2007 10:30 pm 
Peter View latest post
 No new posts Note 68     Peter    1    1199    Mon Oct 15, 2007 9:24 pm 
Peter View latest post
 No new posts Note 69  
[DNI, 19]
  Peter    2    1292    Fri Jul 10, 2009 4:54 pm 
tenniskidperson3 View latest post
 No new posts Note 70  
[JDS, pp. 31]
  Peter    1    764    Tue Nov 13, 2007 8:08 pm 
mszew View latest post
 No new posts Note 71  
Schur's theorem, [Her, pp. 16]
  Peter    2    1252    Fri May 29, 2009 6:12 am 
hxy09 View latest post
 No new posts Note 72  
[Rh2, pp. 89]
  Peter    1    721    Thu May 28, 2009 3:29 pm 
hxy09 View latest post
 No new posts Note 73  
[Rh2, pp. 125]
  Peter    1    841    Wed Nov 14, 2007 1:06 am 
MellowMelon View latest post
 No new posts Note 74  
[Rh2, pp. 145]
  Peter    1    720    Thu May 28, 2009 2:18 pm 
hxy09 View latest post
 No new posts Note 75  
[Rh2, pp. 202]
  Peter    1    761    Thu May 28, 2009 4:14 pm 
hxy09 View latest post
 No new posts Note 76  
[Rh3, pp. 213]
  Peter    2    853    Fri May 29, 2009 4:48 am 
hxy09 View latest post
 No new posts Note 77  
[Rh3, pp. 51]
  Peter    1    850    Thu May 28, 2009 3:20 pm 
hxy09 View latest post
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