On Jan 23, 2010, at 9:43 PM, Dr. David Kirkby wrote:
Nick Alexander wrote:
IMHO, that is far too trivial. Most 14 year old school child will
know what that is.
You say that like it is a Bad Thing.
Well it is if you want to stop a spammer. They want to edit the
page, so they answer such a simple question, and away they go. How
is knowing the next prime after 7 any more difficult than knowing
the name of some maths software which uses python?
It's enough to stop a script--especially if we changed it ever several
month. I think we'll discourage valid users before we're able to
discourage all spammers.
What about the next prime after 10**9? Anyone using Sage could answer
this one--we could even ask it as "next_prime(10^9)."
- Robert
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