a challenge to all you maths nerds out there :) (1 Viewer)

[Aquawhite]

english is shit

Tis not. I love the analysis of the English literature. Literacy is boring... English is very interesting and fun ^_^.

Anyway, this problem was solved... it wasn't too hard to see for most of you... I wish I got there! >.<

 

[addikaye03]

Pattern of n^2+n

 

[madsam]

less than 10 seconds

easy

 

[Joel8945]

hey guys this is a maths challenge

it has been said maths/engineering majors can solve it in under 3 mins, analytical thinkers can solve it in 6 hours and english brains can never solve it.

1, 2 ,6, 42, 1806 _ _ _ _ what are the next four numbers?

good luck

say you have:

x_1, x_2, x_3, x_4, x_5 ...

x_1 = sqrt (x_2 - x_1)
x_2 = sqrt (x_3 - x_2)

so x_(n+1) = x_n(x_n + 1)

even try this rule!

x_2 = x_1(x_1+1) = 1*(2) = 2
x_3 = x_2(x_2+1) = 2*(3) = 6
x_4 = x_3(x_3+1) = 6*(7) = 42

ok so I have proved my rule works!

So the next numbers (I'll call x_6, x_7, x_8, x_9) are:

x_6 = x_5(x_5+1) = 1806*1807 = 3,263,442
x_7 = x_6(x_6+1) = 3,263,442*3,263,443 = 1.065x10^13
x_8 = 1.13x10^26
x_9 = 1.286x10^52

therefore the sequence is:

1,2,6,42,1806,3263442,1.065x10^13,1.13x10^26,1.29x10^52

Am I right?

 

[Uncle]

:burn:

 

[addikaye03]

say you have:

x_1, x_2, x_3, x_4, x_5 ...

x_1 = sqrt (x_2 - x_1)
x_2 = sqrt (x_3 - x_2)

so x_(n+1) = x_n(x_n + 1)

even try this rule!

x_2 = x_1(x_1+1) = 1*(2) = 2
x_3 = x_2(x_2+1) = 2*(3) = 6
x_4 = x_3(x_3+1) = 6*(7) = 42

ok so I have proved my rule works!

So the next numbers (I'll call x_6, x_7, x_8, x_9) are:

x_6 = x_5(x_5+1) = 1806*1807 = 3,263,442
x_7 = x_6(x_6+1) = 3,263,442*3,263,443 = 1.065x10^13
x_8 = 1.13x10^26
x_9 = 1.286x10^52

therefore the sequence is:

1,2,6,42,1806,3263442,1.065x10^13,1.13x10^26,1.29x10^52

Am I right?

hey joel, yer thats all correct man. It follows the pattern n(n+1) [similarly n^2+n]

 

[Miss Sunshine]

too easy =)

 

[suzlee]

omg I feel so smart!!!!!!!

 

[Aquawhite]

hey guys this is a maths challenge

it has been said maths/engineering majors can solve it in under 3 mins, analytical thinkers can solve it in 6 hours and english brains can never solve it.

1, 2 ,6, 42, 1806 _ _ _ _ what are the next four numbers?

good luck

I guess a lot of the people in this thread are maths/engineering majors! ^_^

 

[khorne]

or know how to google the combination for the MILLION other responses on various forums.

 

[Iruka]

On-line Encyclopedia of Integer Sequences.

1,2,6,42,1806 - OEIS Search Results

Hours of fun.

 

[Uncle]

I guess a lot of the people in this thread are maths/engineering majors! ^_^

wow fuck this.

.

 

[shuning]

回复: Re: a challenge to all you maths nerds out there

me 2! got it under a min...lol..cheated with cal =P

i like the pattern

same here xD

 

[EvoRevolution]

took me <5min to solve it


1,2,6,42,1806,(1806*1807)

u just add 1 to the number before and times it by that number

so to get 1806

its 42 * 43+1 = 1806

 

[rheyn]

Hell Yeah, got it in 45 secs! I guess that's what UMAT training does to you lol

 

[emmcyclopedia]

english is shit

naww, that's not very nice!
lol, if english is so bad, then why do you use it?

 

[tommykins]

naww, that's not very nice!
lol, if english is so bad, then why do you use it?

i'd use vietnamese if i was in vietnam.

whats your point?

 

[emmcyclopedia]

i'd use vietnamese if i was in vietnam.

whats your point?

Hey, ease up, this wasn't meant to be taken badly! My point? I'm merely highlighting the irony of your statement, considering that English is your primary method of communication on this forum. I think language and communication is an art form which is often the subject of much misplaced antagonism.
Nevertheless, each to their own.

or, as you may prefer it...

" Này, dễ dàng lên, điều này không có nghĩa là để được đưa xấu! Điểm của tôi? Tôi chỉ nêu bật những lý buồn tuyên bố của bạn, xem xét rằng Tiếng Anh của bạn chính là phương thức giao tiếp trên diễn đàn này. Tôi nghĩ rằng ngôn ngữ và thông tin liên lạc là một hình thức nghệ thuật mà thường là chủ đề của nhiều không phù hợp ghét.
song le, mỗi mình..."

(sorry my Vietnamese is a little rough)

 

[tommykins]

Hey, ease up, this wasn't meant to be taken badly! My point? I'm merely highlighting the irony of your statement, considering that English is your primary method of communication on this forum. I think language and communication is an art form which is often the subject of much misplaced antagonism.
Nevertheless, each to their own.

or, as you may prefer it...

" Này, dễ dàng lên, điều này không có nghĩa là để được đưa xấu! Điểm của tôi? Tôi chỉ nêu bật những lý buồn tuyên bố của bạn, xem xét rằng Tiếng Anh của bạn chính là phương thức giao tiếp trên diễn đàn này. Tôi nghĩ rằng ngôn ngữ và thông tin liên lạc là một hình thức nghệ thuật mà thường là chủ đề của nhiều không phù hợp ghét.
song le, mỗi mình..."

(sorry my Vietnamese is a little rough)

hahaha fuck, nice job.

did you attend viet school or anything?

 

[Michaelmoo]

The number squared plus the number itself, is the next number so:

1, 2, 6, 42, 1806, 3 263 442, 1.065 x 10^13, 1.134 x 10^26, 1.29 x 10^52