The side lengths of a Heronian Triangle
are R-1, R and R+1, where R is an 8-digit positive integer which does not contain any leading zero.
Determine all possible value(s) of R for which this is possible.
The wikipedia article for Equilateral Triangle has a section for Almost Equilateral Heronian Triangles with a link to the integer sequence http://www.research.att.com/~njas/sequences/A003500
This entry even gives the formula derived by Jim K. The only 8 digit number is 27246964
Posted by Jer
on 2009-11-16 15:11:19