Posted: Fri Jun 08, 2007 11:05 am
brother cadfæl?
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Star Turn on 45 Phoenixes
Page 8 of 11
Posted: Fri Jun 08, 2007 12:20 pm
Spot on Harry. It was indeed 'Cloppa Castle'. You are a man after my own heart.
Posted: Fri Jun 08, 2007 12:25 pm
There was no mad witch though - you're thinking of Chorlton & The Wheelies there.
Posted: Fri Jun 08, 2007 12:41 pm
Yes.
What is the missing number in the sequence ?
6, ??????? , 496, 8128.
What is the missing number in the sequence ?
6, ??????? , 496, 8128.
Posted: Fri Jun 08, 2007 2:05 pm
64? can't give a good reason why though.
Posted: Fri Jun 08, 2007 4:55 pm
It's 28 Harry - the first four perfect numbers.
Posted: Fri Jun 08, 2007 5:10 pm
Over to you Grecian.
Posted: Sat Jun 09, 2007 10:32 am
A perfect number is the sum of its own factors. What name is given to a pair of numbers where each number is the sum of the factors of the other? 220 and 284 are the lowest such example.
Posted: Sat Jun 09, 2007 12:34 pm
One has to ask why people work this stuff out. I can only assume they're terrified of having their university research budgets cut, and therefore have to publish papers on something... 
I'll try... parent and child numbers?
I'll try... parent and child numbers?
Posted: Sun Jun 10, 2007 11:13 am
No, although the same does suggest the numbers are well-disposed towards one another. I think it was probably worked out in antiquity, before the days of research budgets...
Posted: Sun Jun 10, 2007 2:13 pm
Actually, now you mention it, I remember the term "Friendly Numbers". Is that it?
Posted: Sun Jun 10, 2007 4:40 pm
If it's old, how about Romulus and Remus numbers !
Posted: Sun Jun 10, 2007 4:45 pm
It's something almost synonymous with friendly numbers - I think friendly numbers are something different, although a few websites appear to be slightly confused on the point.Weyland wrote:Actually, now you mention it, I remember the term "Friendly Numbers". Is that it?
Not Romulus and Remus numbers either.
Posted: Mon Jun 11, 2007 9:51 am
something like complementary numbers?
Posted: Mon Jun 11, 2007 10:50 am
If its like friendly is it 'Amicable numbers'? I have no idea what they are but I'm pretty sure I've heard of them to do with Pythagorus.