Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
BrandonM
on March 12, 2008
|
parent
|
context
|
favorite
| on:
Quick - is 91 prime?
Maybe I'm weird, but I knew right away that 91 = 7 x 13. Apparently you felt the same way.
andr
on March 12, 2008
|
next
[–]
I actually figured 91 = 70 + 21 = 10 * 7 + 3 * 7
andr
on March 12, 2008
|
parent
|
next
[–]
It's funny that I get upvoted for possessing 3rd grade arithmetic skills.
dreish
on March 12, 2008
|
root
|
parent
|
next
[–]
3rd grade in Bulgaria, maybe. To us Americans, that's like an amazing magic trick.
cstejerean
on March 12, 2008
|
prev
[–]
Definitely shouldn't have to resort to tricks to factor 91. The answer really jumps out (70 + 21).
Consider applying for YC's Winter 2026 batch! Applications are open till Nov 10
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
