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References to 'proper divisor'
1. a few examples of solutions to Zn\'am's problem by PrimeFan
2. abundant number by CompositeFan
3. almost perfect number by PrimeFan
4. amicable numbers by alozano
5. An over view of Ahmes Papyrus by milogardner
6. arithmetic by PrimeFan
7. converse of Wilson's theorem by PrimeFan
8. deficient number by PrimeFan
9. determination of abundant numbers with specified prime factors by rspuzio
10. determination of even abundant numbers with one odd prime factor by rspuzio
11. Egyptian fraction by milogardner
12. Egyptian multiplication and division by milogardner
13. formal congruence by pahio
14. formula for sum of divisors by rspuzio
15. Hultsch-Bruins method by milogardner
16. iterated totient function by CompositeFan
17. Leonardo da Pisa by Mravinci
18. number theory by olivierfouquetx
19. practical number by CompositeFan
20. restricted divisors of the first 1000 positive integers by PrimeFan
21. Rhind Mathematical Papyrus by milogardner
22. RMP 53, 54, 55 by milogardner
23. semiperfect number by CompositeFan
24. unitary divisor by CompositeFan
25. untouchable number by PrimeFan
26. Why Study Egyptian Fraction Mathematics by milogardner
27. Zn\'am's problem by Mravinci