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{{short description|Integer that is both a perfect square and a triangular number}}
{{for|squares of triangular numbers|squared triangular number}}
[[File:square_triangular_number_36.svg|
In [[mathematics]], a '''square triangular number''' (or '''triangular square number''') is a number which is both a [[triangular number]] and a [[square number|perfect square]]. There are [[Infinity|infinitely many]] square triangular numbers; the first few are:
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