Silliness Quiz - Page 910

pdurrant · 04-25-2014, 02:28 PM

OK, I arbitrarily declare Bilbo1967 the winner, since he got the more difficult sequences.

The two nobody got were

g) 1, 6, 15, 28, ?

The Hexagonal Numbers, the next being 45.

and

j) 6, 28, 496, 8128, ?

The Perfect Numbers, the next being 33550336 (I did say people could look that one up!)

There are only 48 known perfect numbers, and no-one knows whether there are a finite or an infinite number of perfect numbers. It's known that there are at least as many perfect numbers as there are Mersenne Primes, and the corresponding perfect number to each Mersenne Prime is even. It is not known whether there are any odd perfect numbers.

Glorfindel · 04-25-2014, 02:45 PM

I did look up j

Stitchawl · 04-25-2014, 08:33 PM

Paul, while in my limited fashion I can understand the 'uses' of Geometry and trig (if not actually use them myself,) so I'm not all bad, but to what purpose do 'Perfect Numbers' serve?

Stitchawl

pdurrant · 04-26-2014, 04:17 AM

Quote:

Originally Posted by Stitchawl

Paul, while in my limited fashion I can understand the 'uses' of Geometry and trig (if not actually use them myself,) so I'm not all bad, but to what purpose do 'Perfect Numbers' serve?

They are just interesting. For instance, it's been proved that any even perfect number expressed in base ten ends in 6 or 28.

Some people like maths.

Stitchawl · 04-26-2014, 06:10 AM

Quote:

Originally Posted by pdurrant

They are just interesting. For instance, it's been proved that any even perfect number expressed in base ten ends in 6 or 28.

Thanks. There was no mention of usage in Wiki, and I was curious.

Quote:

Some people like maths.

Proves the old saying; à chacun son goût, eh?

Stitchawl

Bookpossum · 04-26-2014, 08:56 PM

It's okay Stitchy - I am clueless about maths, and my husband loves and appreciates its elegance, so we just shake our heads kindly at each other.

Stitchawl · 04-26-2014, 11:59 PM

Quote:

Originally Posted by Bookpossum

It's okay Stitchy - I am clueless about maths, and my husband loves and appreciates its elegance, so we just shake our heads kindly at each other.

I had to take an accounting class as a pre-req for my MBA and MPA. (My undergrad degrees weren't in business.) Each class, the teacher would spend the first 5 minutes showing everyone some new and special 'trick' for manipulating numbers, such as how to add up a column of 5-diget numbers in your head, etc. He was always so incredibly excited taking about these that it was a pure delight listening to him, even if I had no idea what he was talking about!

Stitchawl

Gazella · 04-27-2014, 08:17 AM

It's been two days. We need a quiz going here

pdurrant · 04-27-2014, 08:52 AM

While we wait for Bilbo1967 to provide a quiz, here's a quick question that's this week's Richard Wiseman's Friday Puzzle:

Yesterday my friend and I started to walk down a road. We began our walk at the same time, from the same point, and headed in the same direction. I walk at a constant speed of 5 km/h and my friend walks at a constant speed of 6 km/h. Throughout the walk a dog ran between the two of us again and again, with a constant speed of 10 km/h

How far did the dog travel in 1 hour?

Stitchawl · 04-27-2014, 09:15 AM

I know! I know!

10K!

Stitchawl

pdurrant · 04-27-2014, 01:13 PM

Quote:

Originally Posted by Stitchawl

I know! I know!

10K!

Stitchawl

Yes! Stichawl won a maths question!

Where is Bilbo1967? (No, that's not a quiz question.)

Gazella · 04-28-2014, 05:22 AM

How did you get 10K?

orlok · 04-28-2014, 05:24 AM

Quote:

Originally Posted by Gazella

How did you get 10K?

I wouldn't even know where to start the calculation for that one...

pdurrant · 04-28-2014, 05:42 AM

The only important bits in the question are these:

"Throughout the walk a dog ran [...] with a constant speed of 10 km/h

How far did the dog travel in 1 hour? "

All the rest are red herrings, designed to trap those who think it's a mathematical puzzle when it's really a spotting the essentials puzzle.

Gazella · 04-28-2014, 05:51 AM

I was overthinking it

04-28-2014, 05:42 AM	#13649
pdurrant The Grand Mouse 高貴的老鼠 Posts: 74,106 Karma: 315558332 Join Date: Jul 2007 Location: Norfolk, England Device: Kindle Oasis	The only important bits in the question are these: "Throughout the walk a dog ran [...] with a constant speed of 10 km/h How far did the dog travel in 1 hour? " All the rest are red herrings, designed to trap those who think it's a mathematical puzzle when it's really a spotting the essentials puzzle. Last edited by pdurrant; 04-28-2014 at 05:53 AM.

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04-25-2014, 02:28 PM	#13636
pdurrant The Grand Mouse 高貴的老鼠 Posts: 74,106 Karma: 315558332 Join Date: Jul 2007 Location: Norfolk, England Device: Kindle Oasis	OK, I arbitrarily declare Bilbo1967 the winner, since he got the more difficult sequences. The two nobody got were g) 1, 6, 15, 28, ? The Hexagonal Numbers, the next being 45. and j) 6, 28, 496, 8128, ? The Perfect Numbers, the next being 33550336 (I did say people could look that one up!) There are only 48 known perfect numbers, and no-one knows whether there are a finite or an infinite number of perfect numbers. It's known that there are at least as many perfect numbers as there are Mersenne Primes, and the corresponding perfect number to each Mersenne Prime is even. It is not known whether there are any odd perfect numbers.

04-25-2014, 02:45 PM	#13637
Glorfindel Force-Aware Elf Posts: 4,762 Karma: 11557898 Join Date: Feb 2014 Location: Valinor Device: Kindle 4 w/SO	I did look up j

04-25-2014, 08:33 PM	#13638
Stitchawl Opsimath Posts: 12,344 Karma: 187123287 Join Date: Mar 2009 Location: Chiang Mai, Northern Thailand Device: Sony PRS-650, iPhone 5, Kobo Glo, Sony PRS-350, iPad, Samsung Galaxy	Paul, while in my limited fashion I can understand the 'uses' of Geometry and trig (if not actually use them myself,) so I'm not all bad, but to what purpose do 'Perfect Numbers' serve? Stitchawl

04-26-2014, 08:56 PM	#13641
Bookpossum Snoozing in the sun Posts: 10,146 Karma: 115423645 Join Date: Jul 2011 Location: Melbourne, Australia Device: iPad Mini, Kobo Touch	It's okay Stitchy - I am clueless about maths, and my husband loves and appreciates its elegance, so we just shake our heads kindly at each other.

04-27-2014, 08:17 AM	#13643
Gazella Wizard Posts: 1,705 Karma: 4619474 Join Date: Nov 2012 Device: Kindle Scribe, Kindle Paperwhite	It's been two days. We need a quiz going here

04-27-2014, 08:52 AM	#13644
pdurrant The Grand Mouse 高貴的老鼠 Posts: 74,106 Karma: 315558332 Join Date: Jul 2007 Location: Norfolk, England Device: Kindle Oasis	While we wait for Bilbo1967 to provide a quiz, here's a quick question that's this week's Richard Wiseman's Friday Puzzle: Yesterday my friend and I started to walk down a road. We began our walk at the same time, from the same point, and headed in the same direction. I walk at a constant speed of 5 km/h and my friend walks at a constant speed of 6 km/h. Throughout the walk a dog ran between the two of us again and again, with a constant speed of 10 km/h How far did the dog travel in 1 hour?

04-27-2014, 09:15 AM	#13645
Stitchawl Opsimath Posts: 12,344 Karma: 187123287 Join Date: Mar 2009 Location: Chiang Mai, Northern Thailand Device: Sony PRS-650, iPhone 5, Kobo Glo, Sony PRS-350, iPad, Samsung Galaxy	I know! I know! 10K! Stitchawl

04-28-2014, 05:22 AM	#13647
Gazella Wizard Posts: 1,705 Karma: 4619474 Join Date: Nov 2012 Device: Kindle Scribe, Kindle Paperwhite	How did you get 10K?

04-28-2014, 05:51 AM	#13650
Gazella Wizard Posts: 1,705 Karma: 4619474 Join Date: Nov 2012 Device: Kindle Scribe, Kindle Paperwhite	I was overthinking it