1 Having heard a radio presenter sign off by saying “We’ve ran out of time” Pedanticus prowled the corridors of the flat growling; so I was careful to distract him during a programme in which quite learned folk said not only “zoo-ology” but – O horror horrorum! – “a bacteria”. Why might hearing this have driven him over the edge?
2 On BBC Radio 4 I mentioned David Singmaster’s pencil bearing a truncatable prime – a prime number such that as you strike off digits one at a time from one end, the number you are left with is also a prime. There are left-truncatable primes, such as 9137 (as 9137, 137, 37 and 7 are all prime) and right-truncatable primes like 7193 (7193, 719, 71 and 7 are all primes). Now do you suppose the prime on David’s pencil is lefttruncatable – or right-truncatable?
3 If you multiply 4321 by this 4-digit number the answer you get ends in its reverse, ie 1234. That’s to say: 4321 X **** = ****1234. What is the 4-digit number? Twitter: @ChrisMaslanka
Find the correct definitions for each:
a) part of a sundial b) pithy maxim c) town in Alaska d) the known world
NACARAT a) orange-red colour b) species of bird with percussive call c) board game d) card game
Identify this word in which each asterisk represents a missing letter:
Identify these two words, the spelling of which differs only in the letters shown:
B****** (blessing) V****** (game)
Game – and two sorts of bacon (10)
Find a word that follows the first word in the clue and precedes the second, in each case making a fresh word or phrase. For example the answer to fish mix could be cake (fishcake & cake mix) and to bat man it could be he (bathe & he- man) ... a) moons driver b) gang registry c) farm arm d) mountain finder e) bombs hound f) rubbish toe