0,2

No a(4) < 10^13.

a(2) = 210 is the smallest area common to 2 primitive Pythagorean triangles (viz. triples {20, 21, 29}, {12, 35, 37}); followed by 2730 (triples {60, 91, 109}, {28, 195, 197}); 7980 (triples {95, 168, 193}, {40, 399, 401}); 71610 (triples {341, 420, 541}, {132, 1085, 1093}); ...

Cf. A024407, A055193.

Adjacent sequences: A093533 A093534 A093535 this_sequence A093537 A093538 A093539

Sequence in context: A099788 A126676 A073100 this_sequence A002037 A030265 A007221

hard,more,nonn

Lekraj Beedassy (blekraj(AT)yahoo.com), May 14 2004

Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 2 2004