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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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