# WELCOME TO THE EXCITING WORLD OF MATHEMATICS

### Happy pi approximation day

### Movies Related to Mathematics

2. A Brilliant Young Mind (2014)

3. Good Will Hunting (1997)

4. IQ(1994)

5. The Number 23 (2007)

6. Proof (2005)

7. Contact (1997)

8. Sphere (1998)

9. Stand and Deliver (1988)

10. cube(1997)

11. 21 (2008)

12. The 4th Dimension (2006)

13. Bianca (1984)

14. Fermat's Last Tango (2001 Video)

15. Fermat's Room (2007)

16. Hotel Hilbert (1996 TV Movie)

17. Numb3rs (2005)

18. The Man Without a Face (1993)

19. A Brief History of Time (1992)

20. The Theory of Everything (2014 film)

21. Primer (2004)

22. Enigma (2001)

23. Sneakers(1992)

24. 21 grams (2003)

25. Pi(1998)

26. Straw dogs (1971)

27. A summer's tale (1996)

### What's the next number?

The next number might be:

• 10, if this is the sequence of natural numbers;

• 1, if this is the sequence of the digital sums of natural numbers;

• 11, if this the sequence of palindromes;

• 0, if this is the sequence of digital products of natural numbers;

• 13, if this is the sequence of numbers such that 2 to their powers doesn’t contain 0;

• 153, if this is the sequence of numbers that are sums of fixed powers of their digits;

• 22, if this is the sequence of numbers for which the sum of digits equals the product of digits;

or • any number you want.

### Special properties of number 30 (Today’s Date)

1. 30 is the sum of the first four squares, which makes it a square pyramidal number.

2. The icosahedron and the dodecahedron are Platonic solids with 30 edges.

3. 30 is a Harshad number ( an integer that is divisible by the sum of its digits)

4. The atomic number of zinc is 30

5. The minimum age for United States senators.

6. February 30 is usually used as a sarcastic date for referring to something that will never happen or will never be done.

### Special properties of number 29 (Today’s Date)

1. None of the first 29 natural numbers have more than two different prime factors. This is the longest such consecutive sequence.

2. 29 is the sum of three consecutive squares i.e. 29 = 2^2 + 3^2 + 4^2

3. The number of days February has in leap years.

4. The atomic number of copper

5. Saturn requires over 29 years to orbit the Sun.

6. Number of states in india

### Special properties of number 28 (Today’s Date)

1. 28 is a triangular number since it is the sum of the first seven counting numbers: 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28.

2. 28 is also a perfect number since the sum of its aliquot divisors (factors that are less than the number itself) is also 28. The aliquot factors of 28 are 1, 2, 4, 7, and 14, and 1 + 2 + 4 + 7 + 14 = 28. The next smallest perfect number is 6, and the next highest perfect number is 496.

3. 28 is an example of a happy number. When you square the digits, add them, and repeat this process on the resulting number, you eventually end up with 1:

2^2 + 8^2 = 68

6^2 + 8^2 = 100

1^2 + 0^2 + 0^2 = 1

4. The sum of the first five prime numbers is 2 + 3 + 5 + 7 + 11 = 28.

5. 28 is a hexagonal number, but not a centered hexagonal number. Every hexagonal number is also a triangular number, but not every triangular number is a hexagonal number.

6. A polygon with 28 sides is called an icosikaioctagon.

7. Between the years 2000 and 2099, the calendar repeats every 28 years. It also cycles every 28 years between 2101 and 2199.

### Special properties of number 27 (Today’s Date)

1. Twenty-seven is a perfect cube = 3^3.

2. In base 10, it is the first composite number not evenly divisible by any of its digits.

3. 27 is the only positive integer that is 3 times the sum of its digits.

4. 27 is a Harshad number (a number divisible by sum of its digits).

5. 27 is the smallest 2-digit number in which the sum of digits is equal to the sum of prime factors, e.g.: 27 = 3 x 3 x 3 and 2 + 7 = 3 + 3 + 3 = 9

6. 23 is the largest integer which is the sum of the digits of its cube:

27^3 = 19,683 and 27 = 1 + 9 + 6 + 8 + 3

7. 27 is the number of "cubies" in a Rubik's cube.

8. The numbers of atoms in the body of an average male (about 80 kg) is about 10^27.

9. The Chemical Element Cobalt has an atomic number of 27.

10. The primitive Greek alphabet had 27 letters.

11. There are 27 signs of the zodiac in Indian astrology