composite numbers congruent to +-1 mod 6

[sunshaker]

I was wondering if someone can explain this in simple terms

Composite numbers congruent to +-1 mod 6.

25, 35, 49, 55, 65, 77, 85, 91, 95, 115, 119, 121, 125, 133, 143, 145, 155, 161, 169, 175, 185, 187, 203, 205, 209, 215, 217, 221, 235, 245, 247, 253, 259, 265, 275, 287.

 

Doh,I get it now, after writing this down

 

I was just trying to better understand these composite numbers(green) that came up on the prime line of this wave and why primes(yellow) other than 2/3 all fall on this line?

 

 

Is it easier to work out these composite numbers than to work out primes?

Is there a simple way to work these(composite numbers +-1mod 6) out.

 

So in effect following this line, crossing out composite numbers +-1mod 6, And what you are left with will be primes?

 

Edit:, LINE 1,3 Are even numbers(no primes), Line 4, "Odd" multiples of 6 start +3(no primes).

 

Is there a simple way of writing all this in a equation?

Edited October 11, 2014 by sunshaker