Away back when in one of my blogs I was advancing the theory that this universe is based on the number 3. For instance, we have 3 dimensions, length, width and height. Three strikes and you’re out. Things, good or bad, usually happen in 3’s. Most discussions have 3 major points. Traffic lights usually have 3 lights, red for stop, yellow for caution and green for go. You are usually given 3 chances to accomplish something. Most people can only remember 3 things on a list. The triangle, consisting of 3 sides is the strongest form of construction. The people you know in your life can be classified as acquaintances, friends and soulmates. If you organize a speech, tell them what you are going to say, say it and tell them what you said. Anyway, I got to thinking about primes again. Prime numbers are numbers that you can only divided evenly by themselves and one. For instance 17 is a prime number. It can only be divided evenly by itself and 1. If you divide 17 by any number that precedes it the answer is a fraction (Ex: 17/4 = 4 ¼ ). If you look at a table of prime numbers you will see their last digit is a 1, 3, 7 or 9 once you get beyond 1 digit numbers such as 5 or 2.

Finding Primes Using The Number 3

A prime number usually ends in 1, 3, 7 or 9.

Total the digits in the number ending in 1, 3, 7 or 9 (ex. 677 has the digits (6,7,7,) when totaled = 20 (6 +7 +7 = 20)

Divide the digit total (20) by 3,

If the answer contains a fraction (20/3 = 6.666666667) 677 is a prime.

If the answer doesn’t contain a fraction the number is not a prime. For instance 27 isn’t a prime because (2+7=9) and 9 divided by 3 is an even number ( 9/3 =3.)

Prime =11

Total = 2

Total / 3 = 0.666666667

Prime =13

Total = 4

Total / 3 = 1.333333333

Prime =17

Total = 8

Total/3= 2.666666667

Prime = 19

Total = 10

Total /3 = 3.333333333

Prime = 23

Total = 5

Total/3 = 1.666666667

Prime = 29

Total = 11

Total/3= 3.666666667

Prime = 31

Total = 4

Total/3 = 1.333333333

Prime = 37

Total = 10

Total / 3 = 3.333333333

Prime = 41

Total = 5

Total/3 = 1.666666667

Prime =43

Total = 7

Total/3 = 2.333333333

Prime= 47

Total = 11

Total/3 = 3.666666667

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