Prime Spiral
The numbers arranged in a Spiral
with Primes indicated in black, as first drawn by S. Ulam. Unexpected patterns of diagonal lines are apparent in such a plot,as illustrated in the above
grid.
References
Dewdney, A. K. ``Computer Recreations: How to Pan for Primes in Numerical Gravel.'' Sci. Amer. 259, 120-123, July 1988. Lane, C. ``Prime Spiral.'' http://www.best.com/~cdl/PrimeSpiralApplet.html.
Weisstein, E. W. ``Prime Spiral.'' Mathematica notebook PrimeSpiral.m.
- Seed of Life
- Seek Time
- Segment
- Segmented Number
- Segner's Recurrence Formula
- Segre's Theorem
- Seiberg-Witten Equations
- Seiberg-Witten Invariants
- Seidel-Entringer-Arnold Triangle
- Seifert Circle
- Seifert Conjecture
- Seifert Form
- Seifert Matrix
- Seifert's Spherical Spiral
- Seifert Surface
- Self-Adjoint Matrix
- Self-Adjoint Operator
- Self-Avoiding Walk
- Self-Conjugate Subgroup
- Self-Descriptive Number
- Self-Homologous Point
- Self Number
- Self-Reciprocating Property
- Self-Recursion
- Selfridge-Hurwitz Residue