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Reference.org
Square triangular number
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a square triangular number (or triangular square number) is a number which is both a <a href="/facts/Triangular_number/KHonHtQJ">triangular number</a> and a <a href="/facts/Square_number/jfakASPK">square number</a>. There are <a href="/facts/Infinity/cF506uD7">infinitely many</a> square triangular numbers; the first few are: </p> 0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881, 55420693056, 1882672131025 (sequence A001110 in the <a href="/facts/On-Line_Encyclopedia_of_Integer_Sequences/yow6cVsU">OEIS</a>)