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==DEFICIENTNUMBERS==

==DEFICIENTNUMBERS==

*Deficient number is a number <math>n</math> for which the sum of divisors <math>\sigma(n)<2n</math>, or, equivalently, the sum of proper divisors (or aliquot sum) <math>s(n)<n</math>. The value <math>2n − sigma(n)</math> (or <math>n − s(n)</math>) is called the number's deficiency.

*Deficient number is a number <math>n</math> for which the sum of divisors <math>\sigma(n)<2n</math>, or, equivalently, the sum of proper divisors (or aliquot sum) <math>s(n)<n</math>. The value <math>2n − \sigma(n)</math> (or <math>n − s(n)</math>) is called the number's deficiency.

==Examples==

==Examples==