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COMMENT
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a(9) is greater than 30000000, if it exists. a(10) and a(11) are unknown. a(12) through a(16) are 204435, 26565, 15015, 41055, 153153. - Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 13 2006
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EXAMPLE
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a(3)=105 because 105 is the first odd short leg of the 3 primitive Pythagorean triples, viz. (105, 208, 233), (105, 608, 617), (105, 5512, 5513), followed by such triples of primitive Pythagorean triangles each starting with 165, 195, 231, 255, 273, 285, 429, 715, 765, 819, 935, 969, 1001, ...
Similarly, a(4)=315 because the group of 4 odd-short-leg primitive Pythagorean triangles (315, 572, 653), (315, 988, 1037), (315, 1972, 1997), (315, 49612, 49613) precedes all such groups of 4 primitive Pythagorean triangles each starting with 385, 455, 495, 693, ...
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