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University Challenge

  Toneman 10:18 30 Nov 2010

Any one watch University Challenge last night. I thought he was wrong to deny UCL the final points, although it wouldn't have given them a win. The question, as I heard it, was "what is the second lowest two digit prime number the digits of which are also prime numbers". The answer given was 13, presumably on the basis that the first was 11. I presume the required answer was 17, but it wasn't made clear that the individual digits had to be different. Am I wrong, have I missed something...

  natdoor 11:45 30 Nov 2010

Or even 35!

  natdoor 15:04 30 Nov 2010

Humble apologies. I got carried away and looked for two prime digits and forgot that the result must be prime. Note to myself, read the question!!

  Forum Editor 16:18 30 Nov 2010

have raged for some time, but on balance it's probably correct to say that mathematicians agree that it isn't, although it used to be considered a prime many years ago.

  Quickbeam 16:22 30 Nov 2010

That explanation confirms why I think the episode with The Young Ones in it is high brow...

  Toneman 18:24 30 Nov 2010

FE so your "many years ago" takes me back to my school days; as always, the goal posts have been the final whistle went on the programme before himself gave the correct answer we shall probably never know what was expected...

  natdoor 20:09 30 Nov 2010

Having looked at the question as posed by Toneman, it seems that the lowest prime would be 23 and the next would be 29 if 1 is not considered prime. It was in my day.

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