Numerically, 31 is the third Mersenne prime, of the form 2n-1, and is one of only two numbers expressible in two different ways as the sum of successive powers:
31 = 1+5+52 = 1+2+22+23+24
(the other such number is 8191).
Thirty-one is also:
The gestation period, in days, of a rabbit.
The bones in a human leg.
The ideal score in cribbage.
The mean Fahrenheit temperature in Denmark in February.
The days and nights under a cold stone for the toad in the witches' spell in Macbeth.
A somewhat T in C edition of our "26 L of the A" (Letters of the Alphabet) format this week. We have three Chambers Dictionaries for decoding the following. Try tomorrow if you can't solve them today:
2 M C S T B
4 H a J G F
9 G F N
A in 1d
A 4 1, 1 4 A (T 3 M).
Entries, by 12 April, to: Pastimes, the Independent, 1 Canada Square, Canary Wharf, London E14 5DL.
17 March Competition report:
13 Unlucky for Some; 15 Minutes Everyone will be famous (Andy Warhol); 21 Points (Pips) on a Die (Dice); 21 Shillings in a Guinea; 25 Years for a Silver Wedding. Prizes to Anne Key (Oxon), John Whiting (St John's Wood), Jean Drane (Ealing).Reuse content