## 5.11.10

### Number-Theoretic Studies on the Abundancy Index

B. Active / Former Number Theory Researchers on The Abundancy Index

Ludwick (1994) - Analysis of the Ratio Sigma(n)/n
[ludwick@math.temple.edu]

Holdener and Riggs (1998) - Consecutive Perfect Numbers (actually, the Lack Thereof!)

Holdener and Ma (2005) - When Thue-Morse Meets Koch

Holdener and Stanton (2007) - Abundancy Outlaws of the Form I(N) + (t/N)

Holdener and Czarnecki (2008) - Tracking Down Abundancy Outlaws

[holdenerj@kenyon.edu]

Ryan (2002) - Results Concerning Uniqueness for I(x) = I(p^n)I(q^m)

Ryan (2003) - A Simpler Dense Proof Regarding the Abundancy Index

Ryan (2006) - Results Concerning An Equation of Goormaghtigh and Related Topics

Ryan (2009) - Improvements on Previous Abundancy Results

[RRyan@marymountpv.edu]