Assertion: thirty | /r/HasProperty | a semiperfect number
Facets:
Source sentences:
text: Adding up some subsets of its divisors (e.g., 5, 10 and 15) gives 30, hence 30 is a semiperfect number.
text: Adding up some subsets of its divisors (e.g., 5, 10 and 15) gives 30, hence 30 is a semiperfect number.