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Prime Numbers 1-100
There are 25 prime numbers that are less than one hundred. How many can you name in 45 seconds?
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Last updated: October 11, 2019
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| First submitted | November 11, 2011 |
| Times taken | 41,175 |
| Average score | 72.0% |
| Rating | 4.51 |
0:45
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BillCipher
+2
Level 10
Apr 10, 2016
Nailed it with approximately 1:20.0000000000000000 left :|
Panifex
+3
Level 28
May 21, 2016
This should be 30 seconds
redsplat
+8
Level 75
Nov 8, 2022
Feel free to complete it in 30 seconds :)
Insaniot
+4
Level 56
Apr 13, 2018
Funk whiz
YouLoveEagle
+2
Level 50
Apr 30, 2022
guys fun fact:Any number above two that is a even number is a composite number meaning it’s not a prime number
Dimby
+9
Level 73
Oct 25, 2022
Fun fact: because half of all numbers are divisible by 2, we know that less than half of all numbers are prime. We also know that 1/3 of the remaining 1/2 are not prime because they are divisible by 3, so 1/2 + 1/6 of numbers are not prime-which is 2/3. We also know that numbers divisible by 5 aren't prime! So of the remaining 1/3 potential prime numbers, 1/5 are not prime, meaning 1/3*1/5 = 1/15. 1/15+2/3 = 11/15...
YouLoveEagle
+1
Level 50
Nov 8, 2022
Still though, crossing almost half is decent
nickig
+1
Level 42
Nov 9, 2022
thats pretty common knowledge tho
andenal
+2
Level 50
Nov 9, 2022
5 is also a factor of 10 so no prime number (except 5 itself) can ever end with 5. Therefore all prime numbers larger than 5 end with 1,3,7 or 9.
KING55
+1
Level 86
Oct 25, 2022
Great quiz! Could probably be done in less than 30 seconds.
rcshelton23
+2
Level 56
Nov 8, 2022
I barely did it in under 30 seconds first try. But I think this isn't necessarily a speed quiz, so 45 seconds is more than doable
wedgez
+1
Level 22
Nov 9, 2022
i tried this 20 times and i finally got it cause idk prime numbers
DOUGHnut1
+1
Level 35
Nov 11, 2022
bro america taught me that all composite numbers were prime numbers im dead :(
0Watermelon0
+1
Level 22
Nov 13, 2022
Wow! I got them all in 23 seconds!
EpicBunny3
+1
Level 43
Feb 25, 2023
I had 2 left!
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