What is Deficient number?
A '''deficient number''' is when a number is not a [[perfect number]] or a [[abundant number]]. Also all primes, as well as some [[prime powers]], and any divisors of a perfect or deficient number are deficient. 1 is deficient along with 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, [[etc]].<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Deficient Number|url=https://mathworld.wolfram.com/|access-date=2024-03-06|website=mathworld.wolfram.com|language=en}}</ref><ref>{{Cite web|title=What is a Deficient Number ? Definition and Examples|url=https://www.basic-mathematics.com/deficient-number.html|access-date=2024-03-06|website=Basic-mathematics.com}}</ref><ref>{{Cite web|title=The Prime Glossary: deficient number|url=https://t5k.org/glossary/page.php?sort=DeficientNumber|access-date=2024-03-06|website=t5k.org}}</ref> ==References== {{Reflist}} [[Category:Integer sequences]]