Deficient number
= Deficient number
{title2=$s(n)<n$}
{wiki}
A <positive integer> whose <proper-divisor sum> is smaller than itself; equivalently, its <sum-of-divisors function> satisfies $\sigma(n)<2n$. For example, $s(8)=7<8$; also $s(1)=0<1$.
= Deficient number
{title2=$s(n)<n$}
{wiki}
A <positive integer> whose <proper-divisor sum> is smaller than itself; equivalently, its <sum-of-divisors function> satisfies $\sigma(n)<2n$. For example, $s(8)=7<8$; also $s(1)=0<1$.