Definition:Primitive Semiperfect Number

Definition
A primitive semiperfect number is a semiperfect number which is not a multiple of a smaller semiperfect number.

Examples
and so on.

Also known as
A primitive semiperfect number is also known as:
 * a primitive pseudoperfect number
 * an irreducible pseudoperfect number
 * an irreducible semiperfect number

Semiperfect can also be seen hyphenated: semi-perfect.

Also see

 * Multiple of Semiperfect Number is Semiperfect