Square triangular number: Difference between revisions

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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]]. There are [[Infinity|infinitely many]] square triangular numbers; the first few are:

:0, 1, 36, {{val|12251,225}}, {{val|4161641,616}}, {{val|14137211,413,721}}, {{val|4802490048,024,900}}, {{val|16314328811,631,432,881}}, {{val|5542069305655,420,693,056}}, {{val|18826721310251,882,672,131,025}} {{OEIS|id=A001110}}

==Explicit formulas==