1089 * 9 = 9801

123456789 * 8 + 9 = 987654321

987654312/8 = 123456789

1634482758620689655172413793 * 3 = 3163448275862068965517241379

12345679 * 18 = 222222222

12345679 * 27 = 333333333

12345679 * 36 = 444444444

12345679 * 45 = 555555555

12345679 * 54 = 666666666

12345679 * 63 = 777777777

12345679 * 72 = 888888888

12345679 * 81 = 999999999

12 * 9 + 3 = 111

123 * 9 + 4 = 1111

1234 * 9 + 5 = 11111

12345 * 9 + 6 = 111111

123456 * 9 + 7 = 1111111

1234567 * 9 + 8 = 11111111

12345678 * 9 + 9 = 111111111

12345679 * 9 = 111111111

123456789 * 9 + 10 = 1111111111

1^{2}=1

11^{2}=121

111^{2}=12321

1111^{2}=1234321

11111^{2}=123454321

111111^{2}=12345654321

1111111^{2}=1234567654321

11111111^{2}=123456787654321

111111111^{2}=12345678987654321

YourBdayMonth * 2 + 5 * 50 + YourAge - 365 + 115 = Your Month in 100's, Your Age in 00's

A number in the form of abcabc is a multiple of 7, 11, and 13, or 1001!

Every odd number greater than seven is the sum of three prime numbers.

The expression n^{2} - n + 41 generates prime numbers foir all values of n from 1 to 40.

A number is divisible by 3 if the sum of its digits is divisible by 3.

A number is divisible by 4 if the last two digits are divisible by 4.

A number is divisible by 5 if the last digit is either "5" or "0".

A number is divisible by 6 if the sum of its digits is divisible by 3 AND the last digit is even.

A number is divisible by 8 if the last three digits are divisible by 8.

A number is divisible by 9 if the sum of its digits are divisible by 9.

E = energy in ergs

m = mass of the matter in grams

c = speed of light in centimeters per second, c^{2}=9 x 10^{20}

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