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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:
:0, 1, 36, {{val|1225|fmt=gaps}}, {{val|41616}}, {{val|1413721}}, {{val|48024900}}, {{val|1631432881}}, {{val|55420693056}}, {{val|1882672131025}} {{OEIS|id=A001110}}
==Explicit formulas==
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