1. Calculați suma divizori lor ai nr. 30.
D₃₀ = { 1; 2; 3; 5; 6; 10; 15; 30 }
Suma => 1 + 2 + 3 + 5 + 6 + 10 + 15 + 30 <=>
<=> 3 + 3 + 5 + 6 + 10 + 15 + 30 <=>
<=> 6 + 5 + 6 + 10 + 15 + 30 <=>
<=> 11 + 6 + 10 + 15 + 30 <=>
<=> 17 + 10 + 15 + 30 <=>
<=> 27 + 15 + 30 <=>
<=> 42 + 30 <=>
<=> 72
