**Congruent numbers: positive integers n for which there exists a right triangle having area n and rational sides.**

*5, 6, 7, 13, 14, 15, 20, 21, 22, 23, 24, 28, 29, 30, 31, 34, 37, 38, 39, 41, 45, 46, 47, 52*

*3 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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