Spectrum Sequence
A spectrum sequence is a Sequence formed by successive multiples of a Real Number 
rounded down to thenearest Integer 
. If is Irrational, the spectrum is called aBeatty Sequence.
- Removable Singularity
- Rencontres Number
- Rendezvous Values
- Repartition
- Repdigit
- Repeating Decimal
- Repfigit Number
- Replicate
- Representation
- Reptend Prime
- Rep-Tile
- Repunit
- Residual
- Residual vs. Predictor Plot
- Residue Class
- Residue (Complex Analysis)
- Residue (Congruence)
- Residue Index
- Residue Theorem (Complex Analysis)
- Residue Theorem (Group)
- Resolution
- Resolution Class
- Resolution Modulus
- Resolvable
- Resolving Tree