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Line 3: 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==

Square triangular number: Difference between revisions