text: Like all triangular numbers , it is the sum of all natural numbers up to a certain point ; in this case : 2p â ' 1 .
simplified: Since any even perfect number has the form 2n 1 ( 2n 1 ) , it is a triangular number , and , like all triangular numbers , it is the sum of all natural numbers up to a certain point ; in this case : 2n 1 .