Hmmm

[skyring]

I noticed one error. The sum of the primes 1-7 is 1+2+3+5+7=18, but that wasn't an option!

I had to guess for the anagram.

Most of these took only a few seconds and were extremely easy. I'm figuring that the scores are inflated a bit.

Besides which, these sorts of tests really only measure how good you are at taking these sorts of tests.

Comments

[thebiblioholic.livejournal.com]

1 isn't a prime number...

[skyring.livejournal.com]

Ahh. See, you can knock a few points offa that inflated score.

Pete, with only the foggiest memory of primary school maths

[miketroll.livejournal.com]

You're right, 1 isn't a prime! But I wonder why not?

Wikipedia says: a prime number (or a prime) is a natural number that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself.

Well you could argue that 1 can be divided by 1 and by itself, but these two divisors are not distinct, I suppose. Seems an arbitrary exclusion.

http://en.wikipedia.org/wiki/Prime_number

[atenea-nike.livejournal.com]

I've always thought it weird that 1 is not a prime number, and I can't seem to find the rationale behind it. It has annoyed me for years.

(And now that I've confessed that prime numbers' issues annoy me, you definitely know I'm weird)

[thebiblioholic.livejournal.com]

See my response to miketroll.

[atenea-nike.livejournal.com]

Thanks! I will finally be able to sleep soundly, after all these years tossing and turning in bed, muttering feverishly: "Why not, oh, why not?"

[thebiblioholic.livejournal.com]

See also:
http://primes.utm.edu/notes/faq/one.html
http://mathforum.org/library/drmath/view/57058.html
http://mathworld.wolfram.com/PrimeNumber.html