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 A095288 Least middle side of 2^n primitive arithmetic triangles, i.e., primitive Heronian triangles whose sides are in arithmetic progression. 1
 4, 28, 364, 6916, 214396, 7932652, 341104036, 20807346196, 1394092195132, 101768730244636, 8039729689326244, 779853779864645668, 80324939326058503804, 8755418386540376914636, 1111938135090627868158772 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a(n) = A095267(n)/3 = a(n-1) * A002476(n). - Ray Chandler, Jul 09 2004 EXAMPLE 6916 is the first middle side belonging to 2^3=8 arithmetic triangles, viz., (3485,6916,10347), (3747,6916,10085), (4133,6916,9699), (4299,6916,9533), (4827,6916,9005), (5045,6916,8787), (5333,6916,8499), (6267,6916,7565) of common differences 3431, 3169, 2783, 2617, 2089, 1871, 1583, 649 respectively and integral areas. (Perimeter is obviously three times middle side and hence the same for all the triangles.) CROSSREFS Cf. A086909. Sequence in context: A193198 A165193 A217903 * A155105 A132685 A180966 Adjacent sequences:  A095285 A095286 A095287 * A095289 A095290 A095291 KEYWORD nonn AUTHOR Lekraj Beedassy, Jul 02 2004 EXTENSIONS More terms from Ray Chandler, Jul 09 2004 STATUS approved

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