Saturday

April 18, 2015

April 18, 2015

Posted by **Andy** on Thursday, December 23, 2010 at 2:36am.

- math -
**drwls**, Thursday, December 23, 2010 at 3:52amYes, it is true.

All PRIME numbers above 3 are of the form 6n − 1 or 6n + 1, because all other numbers are divisible by 2 or 3.

That is, the other numbers above 3 (that cannot be written as 6n-1 or 6n+1) can be written 6n, 6n+2, 6n+3, or 6n+4. All of those are divisible by 2 or 3 and therefore cannot be prime.

(6n+5 can be written 6(n+1)-1 where n+1 is the next integer)

**Answer this Question**

**Related Questions**

math 213 #18 - A student claims that every prime greater than 3 is a term in the...

math - find the rule for the Nth term of the arithmetic sequence. 11/2, 25/6, 17...

Algebra - True or False 1. – 5, – 5, – 5, – 5, – 5, … is an arithmetic sequence...

Math - 1. Find the 12th term of the arithmetic sequence 2, 6, 10, … . 2. Solve ...

MATHEMATICS - THE FIFTH TERM OF AN ARITHMETIC SEQUENCE IS 23 AND THE 12TH TERM ...

math - help me with sequences problem.So if the sequence is 2,5,10,17,26 +3 +5 +...

math - The third and seventh terms of an arithmetic sequence are 10 and 20. 1) ...

Sequence - Find the common difference and a formula formula for the nth term of ...

9th grade math honors - suppose t(1)=-91 and -67 is another term of an ...

Mathematics : Arithmetic Sequence - The 5th term and the 8th term of an ...