Beraha Constants
The 
th Beraha constant is given by
The first few are
 |  |  | |
 | |  | |
 | |  | |
 | |  | |
 | |  | |
 | |  | |
 | |  |
They appear to be Roots of the Chromatic Polynomials of planar triangularGraphs.
is 
, where 
is the Golden Ratio, and 
is the Silver Constant.
References
Le Lionnais, F. Les nombres remarquables. Paris: Hermann, p. 143, 1983.
- Sifting Property
- Sigma Algebra
- Sigma Function
- Sigmoid Curve
- Sigmoid Function
- Sign
- Signalizer Functor Theorem
- Signature (Knot)
- Signature (Quadratic Form)
- Signature (Recurrence Relation)
- Signature Sequence
- Signed Deviation
- Significance
- Significance Test
- Significant Digits
- Significant Figures
- Signpost
- Signum
- Silver Constant
- Silverman Constant
- Silverman's Sequence
- Silver Mean
- Silver Ratio
- Similar
- Similarity Axis