Posted by **Emma** on Sunday, June 24, 2012 at 10:39pm.

Is 28851 a prime number?

- Math -
**Count Iblis**, Sunday, June 24, 2012 at 10:47pm
It is divisible by 3:

10 Mod 3 = 1 ------>

10^n Mod 3 = 1^n = 1 ------>

Sum over cn 10^n Mod 3 =

Sum over cn Mod 3

28851 Mod 3 = (2 + 8 + 8 + 5 + 1) Mod 3

= 0

- Math -
**Ms. Sue**, Sunday, June 24, 2012 at 10:49pm
http://primes.utm.edu/lists/small/1000.txt

- Math -
**Reiny**, Sunday, June 24, 2012 at 11:03pm
nope, it is divisible by 3

## Answer this Question

## Related Questions

- PROBLEM SOLVING IN MATHEMATICS - there are two prime numbers between 100 and 199...
- Math - Which of the following is a prime #? a.2 b.19 c.37 d.51 e.67 I choose 2. ...
- math - The Florida Lottery is made up of the numbers 1-49. My mother has ...
- math - The Florida Lottery is made up of the numbers 1-49. My mother has ...
- Math - Plz help dont know how to do this question. Write number 68 as a product ...
- Math Prime Numbers - Grade 7 question: I am a two-digit prime number I am one ...
- math - the florida lottery is made up of the number 1-49. my mother observed ...
- Math - The number p is the product of three different positive prime numbers ...
- Math - Let n = c x p, where p is a prime number, and c is a composite number ...
- Math - ) Form a conjunction from the following two statements and determine if ...