s-Additive Sequence
A generalization of an Ulam Sequence in which each term is the Sum of two earlier terms in exactly
ways. 
-additive sequences are a further generalization in which each term has exactly representationsas the Sum of 
distinct earlier numbers. It is conjectured that 0-additive sequences ultimately haveperiodic differences of consecutive terms (Guy 1994, p. 233).
References
Finch, S. R. ``Conjectures about Finch, S. R. ``Are 0-Additive Sequences Always Regular?'' Amer. Math. Monthly 99, 671-673, 1992. Finch, S. R. ``On the Regularity of Certain 1-Additive Sequences.'' J. Combin. Th. Ser. A. 60, 123-130, 1992. Finch, S. R. ``Patterns in 1-Additive Sequences.'' Experiment. Math. 1, 57-63, 1992. Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 110 and 233, 1994. Ulam, S. M. Problems in Modern Mathematics. New York: Interscience, p. ix, 1964.-Additive Sequences.'' Fib. Quart. 29, 209-214, 1991.
- Duplication Formula
- Duplication of the Cube
- Durand's Rule
- Durfee Polynomial
- Durfee Square
- Dvoretzky's Theorem
- Dyad
- Dyadic
- Dyck's Theorem
- Dye's Theorem
- Dymaxion
- Dynamical System
- Dynkin Diagram
- Dürer's Conchoid
- Dürer's Magic Square
- Dürer's Shell Curve
- e
- Ear
- Early Election Results
- Eban Number
- Eberhart's Conjecture
- Eccentric
- Eccentric Angle
- Eccentric Anomaly
- Eccentricity