Hexagonal number
= Hexagonal number
{title2=$H_n$}
The $n$th <hexagonal number> is $H_n=n(2n-1)$ for a <positive integer> $n$. Since $H_n=T_{2n-1}$, every <hexagonal number> is also a <triangular number>.
= Hexagonal number
{title2=$H_n$}
The $n$th <hexagonal number> is $H_n=n(2n-1)$ for a <positive integer> $n$. Since $H_n=T_{2n-1}$, every <hexagonal number> is also a <triangular number>.