Silverman Constant
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where
is the Totient Function and 
is the Divisor Function.
References
Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/totient/totient.html Zimmerman, P. http://www.mathsoft.com/asolve/constant/totient/zimmermn.html.
- Cauchy Ratio Test
- Cauchy Remainder Form
- Cauchy-Riemann Equations
- Cauchy Root Test
- Cauchy-Schwarz Integral Inequality
- Cauchy-Schwarz Sum Inequality
- Cauchy's Cosine Integral Formula
- Cauchy Sequence
- Cauchy's Formula
- Cauchy's Rigidity Theorem
- Cauchy Test
- Caustic
- Cavalieri's Principle
- Cayley Algebra
- Cayley-Bacharach Theorem
- Cayley Cubic
- Cayley Graph
- Cayley-Hamilton Theorem
- Cayleyian Curve
- Cayley-Klein-Hilbert Metric
- Cayley-Klein Parameters
- Cayley Number
- Cayley's Group Theorem
- Cayley's Hypergeometric Function Theorem
- Cayley's Ruled Surface