Star Turn on 45 Phoenixes

Istenem · Post by **Istenem** » Fri Jun 08, 2007 11:05 am

brother cadfæl?

QuizMaster · Post by **QuizMaster** » Fri Jun 08, 2007 12:20 pm

Spot on Harry. It was indeed 'Cloppa Castle'. You are a man after my own heart.

QuizMaster · Post by **QuizMaster** » Fri Jun 08, 2007 12:25 pm

There was no mad witch though - you're thinking of Chorlton & The Wheelies there.

harry 3 · Post by **harry 3** » Fri Jun 08, 2007 12:41 pm

Yes.

What is the missing number in the sequence ?

6, ??????? , 496, 8128.

Istenem · Post by **Istenem** » Fri Jun 08, 2007 2:05 pm

64? can't give a good reason why though.

grecian · Post by **grecian** » Fri Jun 08, 2007 4:55 pm

It's 28 Harry - the first four perfect numbers.

harry 3 · Post by **harry 3** » Fri Jun 08, 2007 5:10 pm

Over to you Grecian.

grecian · Post by **grecian** » 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.

Weyland · Post by **Weyland** » 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?

grecian · Post by **grecian** » 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...

Weyland · Post by **Weyland** » Sun Jun 10, 2007 2:13 pm

Actually, now you mention it, I remember the term "Friendly Numbers". Is that it?

harry 3 · Post by **harry 3** » Sun Jun 10, 2007 4:40 pm

If it's old, how about Romulus and Remus numbers !

grecian · Post by **grecian** » Sun Jun 10, 2007 4:45 pm

Weyland wrote:Actually, now you mention it, I remember the term "Friendly Numbers". Is that it?

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.

Not Romulus and Remus numbers either.

Istenem · Post by **Istenem** » Mon Jun 11, 2007 9:51 am

something like complementary numbers?

Flying Spaghetti Monster · 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.