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Square triangular number
Integer that is both a perfect square and a triangular number / From Wikipedia, the free encyclopedia
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For squares of triangular numbers, see squared triangular number.
In mathematics, a square triangular number (or triangular square number) is a number which is both a triangular number and a square number. There are infinitely many square triangular numbers; the first few are:
0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881, 55420693056, 1882672131025 (sequence A001110 in the OEIS)
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