[seqfan] One more conjecture for n-gonal numbers

Vladimir Shevelev shevelev at bgu.ac.il
Thu Apr 29 20:03:04 CEST 2010

Conjecture. For every n>=4, except of n=6, there exists a n-gonal number N wich is not k-gonal  for 3<=k<n.
In case of n=6 it is easy to prove that every hexagonal number is also triangular, i.e. N does not exist.

Best regards,

 Shevelev Vladimir‎

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