1. Discrete Mathematics

2. Study of discontinuous numbers

3. Logic, Set Theory, Combinatorics, Algorithms, Automata, Graph Theory, Number Theory, Game Theory, Group Theory, Information Theory, etc.

4. Recreational Number Theory

5. Power of 9s

6. 9 * 9 = 81

7. 8 + 1 = 9

8. Multiply any number by 9 Add the resultant digits together until you get one digit

9. Always 9 e.g., 4 * 9 = = 9

10. Square Root of Palendromic Numbers

11. Square Root of = 11111

12. Square Root of =

13. Pascal’s Triangle

16. The sum of each row results in increasing powers of 2 (i. e
The sum of each row results in increasing powers of 2 (i.e., 1, 2, 4, 8, 16, 32, and so on).
The 45° diagonals represent various number systems. For example, the first diagonal represents units (1, ), the second diagonal, the natural numbers (1, 2, 3, ), the third diagonal, the triangular numbers (1, 3, 6, ), the fourth diagonal, the tetrahedral numbers (1, 4, 10, ), and so on.
All row numbers—row numbers begin at 0—whose contents are divisible by that row number are successive prime numbers.
The count of odd numbers in any row always equates to a power of 2.
The numbers in the shallow diagonals (from 22.5° upper right to lower left) add to produce the Fibonacci series (1, 1, 2, 3, 5, 8, ), discussed in chapter 4.
The powers of 11 beginning with zero produce a compacted Pascal's triangle (e.g., 110 = 1, 111 = 11, 112 = 121, 113 = 1331, 114 = 14641, and so on).
Compressing Pascal's triangle using modulo 2 (remainders after successive divisions of 2, leading to binary 0s and 1s) reveals the famous Sierpinski gasket, a fractal-like various-sized triangles, as shown in figure 7.2, with the zeros (a) and without the zeros (b), the latter presented to make the graph clearer.

17. Leonardo of Pisa, known as Fibonacci
Leonardo of Pisa, known as Fibonacci. Series first stated in 1202 book Liber Abaci

18. 0,1,1,2,3,5,8,13,21,34,55, Each pair of previous numbers equaling the next number of the Sequence.

19. Dividing a number in the sequence into the following number produces the Golden Ratio 1.62 . . .

20. Debussy, Stravinsky, Bartók composed using Golden mean (ratio, section).

21. Bartók’s Music for Strings, Percussion and Celeste

22. Fermat’s Last Theorum to prove that Xn + Yn = Zn can never have integers for X, Y, and/or Z beyond n = 2

23. $1 million prize to create formula for creating next primes without trial and error

24. Magic Squares

25. Square Matrix in which all horizontal ranks all vertical columns both diagonals equal same number when added together

29. Xn+1 = 1/cosXn2