Numbers whose Divisor Sum is Square/Examples

Examples of Numbers whose Divisor Sum is Square

$\sigma_1$ of $3$ is Square

$\map {\sigma_1} 3 = 4 = 2^2$

$\sigma_1$ of $22$ is Square

$\map {\sigma_1} {22} = 36 = 6^2$

$\sigma_1$ of $66$ is Square

$\map {\sigma_1} {66} = 144 = 12^2$

$\sigma_1$ of $70$ is Square

$\map {\sigma_1} {70} = 144 = 12^2$

$\sigma_1$ of $81$ is Square

$\map {\sigma_1} {81} = 121 = 11^2$

$\sigma_1$ of $94$ is Square

$\map {\sigma_1} {94} = 144 = 12^2$

$\sigma_1$ of $115$ is Square

$\map {\sigma_1} {115} = 144 = 12^2$

$\sigma_1$ of $119$ is Square

$\map {\sigma_1} {119} = 144 = 12^2$

$\sigma_1$ of $400$ is Square

$\map {\sigma_1} {400} = 961 = 31^2$