# Please double-check me! (easy, important?)

1. Aug 15, 2006

### CRGreathouse

I'm not entirely sure of my math here, but this should be a simple calculation. I want to make sure I'm right, though, so I'm posting here.

To which of the following bases is N = 252,505,670,761 a strong pseudoprime? {2, 3, 5, 7, 4086253}

Last edited: Aug 15, 2006
2. Aug 15, 2006

### shmoe

It appears to be a strong pseudoprime to the bases 2, 3, 5, and 4086253 but not 7.

3. Aug 15, 2006

### CRGreathouse

Excellent, those were my results. (The 7 was just a double-check and doesn't matter as the others do.) This shows, minimally, that Jaeschke's claim $$\chi_{(2, 3, 5, 4086253)}=736775510329$$ is wrong.
http://math.crg4.com/primes.html

4. Aug 22, 2006

Yup Yup Yup