Generating Prime
numbers
Few methods have been
suggested to generate prime numbers.
Here is yet another way.
Take any odd (o) and even (e) numbers. The difference
between its product and its sum [eo – e – o] or sum of its product and its sum [eo + e + o] in most cases give prime numbers.
When the numbers end with 3 and 4 respectively , the resultant invariably ends
with 5 , a non-prime. If both the numbers are even, the resultant will be even
which cannot be prime.
e.g -1
allowed forbidden
5 2
10- 7 = 3 10 + 7
= 17 11 2
22 -13 =9 22 + 13 = 35
7 2 14 -9
= 5 14 + 9 = 23 17 2
34 – 19 = 15
9 2
18 – 11 = 7
18 + 11
= 29
13 2 26 –
15 = 11 26 + 15 = 41
15 2
30 – 17 = 13 30 + 17 = 47
17 2 34 +
19 = 53
19 2
38 – 21 = 17 38 + 21 = 59
e.g.-2
allowed forbidden
3 4
12 – 7 = 5
12 + 7 = 19 3 6
18 – 9 = 9 18 + 9 = 27
3 8
24 – 11 = 13 24 + 13 = 37 3
12 36 - 15
= 21 36 + 15 = 51
3 10
30 – 13 = 17 30 + 13 = 43 3
14 42 – 17 = 25
3 14
42 +
17 = 59
3 16
48 - 19 = 29 48 +
19 = 67
