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Can you name the most prime numbers under 1000 in 3 minutes?
Enter a number in the box below
Correctly named numbers will show up below
Answers do not have to be guessed in order
List of primes
Included are all primes less than 1000.
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/168 numbers correct
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(Warning: comments may contain spoilers)
Prime Number Blitz! Quiz
Created Oct 26, 2010 in
Featured Aug 30, 2011
Game Plays 26,896
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Oct 27th, 2010 at 02:08 GMT
Feb 4th, 2011 at 03:22 GMT
How did ANYBODY manage to even type them all that quickly, let alone think of them! :o
Mar 17th, 2011 at 03:53 GMT
@All I made this quiz an editor pick, but I wanted to see what people felt about the 3-minute time limit. It is still a blitz because that's a lot of typing to get 168 prime numbers typed. So, let me know what you think is the ideal time. (e.g., leave it at 3 minutes, or add/subtract a minute)
Mar 22nd, 2011 at 19:21 GMT
I didn't come into this quiz KNOWING all the prime numbers under 1000, but I know the possibilities and am a decent typer—and I made it less than halfway through. Given that, I think you could add an extra minute or two and still make it quite hard to finish.
Apr 11th, 2011 at 00:49 GMT
Quite hard... I know some people may be able to memorize it (not many), but without knowing you can get a fair few as long as you type at a decen pace. Either leave the time limit the same or add a minute.
May 29th, 2011 at 03:42 GMT
I find it funny a lot of people made it to ~300 then just decided to try working backwards (997), myself included. Great blitz!
Game published: Aug 30th, 2011 at 19:03 GMT
Aug 30th, 2011 at 19:13 GMT
3 minutes is fine. It's not the type of quiz you are really trying to finish, and too much gets a bit boring. Go 379!
Aug 30th, 2011 at 19:15 GMT
Can't believe some people can get 100% in 3 minutes.
Aug 30th, 2011 at 19:23 GMT
I now have blisters on my fingers from the burns I got while typing.
Aug 30th, 2011 at 20:13 GMT
I'd really like to know how some people got all of them. Hopefully, this quiz is like the video game in the Last Starfighter and those people are on their way to doing something much more important like saving the galaxy.
Aug 30th, 2011 at 21:13 GMT
Well, I was gonna use Eratosthenes' sieve for this quiz (aka cheat), but then I realized it'd probably take more time to write down all the numbers 1-1000 and cross out even numbers and multiples of 3, 5, 7, etc. than it would to just name the primes.
Aug 30th, 2011 at 22:39 GMT
You know, it's kind of a cool idea, but I found myself losing interest after about 20 numbers. Maybe fewer answers with a shorter time limit would work better.
Aug 30th, 2011 at 23:20 GMT
It becomes repetitive. I stopped thinking and started to punch in every odd numbers.
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Aug 30th, 2011 at 23:43 GMT
50/168! Not bad for a bloke from the U.K (or whatever they call themselves)!
Aug 30th, 2011 at 23:48 GMT
Really made my day, this being published. Thanks, Sporcle!!
Aug 31st, 2011 at 01:51 GMT
I really lost interest. I got about 20, and then I gave up. It's a good idea, and it was good that it got published, but maybe there should be less numbers and a lower time limit.
Aug 31st, 2011 at 01:55 GMT
Wow...looks an awful lot like a quiz I made way back in 2009 (http://www.sporcle.com/games/tom/primenumber_blitz) Wtf?
Aug 31st, 2011 at 02:05 GMT
Tom, you got ripped off.
Aug 31st, 2011 at 04:51 GMT
so i started playing, got all of them up to 71, then looked at the timer and it was still at 3 minutes! weirdest thing ever. has this ever happened to anyone else??
Aug 31st, 2011 at 10:47 GMT
I got all of the numbers under 200 (I had to memorize them for a math test) and then 971, which I don't even remember typing in. I think it happened when I somehow forgot how to type 197 and 199.
Aug 31st, 2011 at 13:04 GMT
All these years I've been cleaning my counters with a prime number! Who knew?
Aug 31st, 2011 at 20:29 GMT
Dunnski: no big surprise there.. composite numbers break down too easily...
Sep 1st, 2011 at 00:54 GMT
i knew all the ones up to 100, after that it's just guessing odd numbers that end in 1, 3, 7 or 9. All prime numbers past 5 end in 1, 3, 7 or 9. (though obviously some numbers like 33 or 99 are not prime).
Sep 1st, 2011 at 01:17 GMT
All right, fess up. Who didn't get the number 3?
Sep 17th, 2011 at 16:19 GMT
Wrote a script to brute force this by simply trying every odd number. I was bored, but not bored enough to actually write a program which would calculate the primes.
Sep 26th, 2011 at 17:52 GMT
13 is the most prime number!
Oct 2nd, 2011 at 22:23 GMT
I just typed 2, 11 21 31 41 51 61..., 3 13 23 33 43 53 63..., 5, 7 17 27 37 47 57 67..., 19 29 39 49 59 69.....until I ran out of time.
Dec 20th, 2011 at 17:44 GMT
@Grambus This has happened to me several times! Really weird
Dec 22nd, 2011 at 09:05 GMT
Love it how higher numbers get gradually less popular, but suddenly 997 appears in the middle of the 300s. Do people get bored and start going from the top?
Jan 24th, 2012 at 07:58 GMT
Deion Sanders would love this quiz. Get it, his nickname is "Prime Time" and this quiz is about "prime" numbers.
May 14th, 2012 at 06:01 GMT
This quiz is way too long, i got less than half way before time expired
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