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1, 3, 6, 55, 66...

Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.


Puzzle ID:#17988
Fun:*** (2.2)
Difficulty:**** (3.13)
Submitted By:fishmedAus******mod




What are the next three numbers in this series?

1, 3, 6, 55, 66, 171, 595, 666, 3003, 5995, ?, ?, ?

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Dec 02, 2004

For those people who don't know what a triangular number is, is a very nice introduction (helped me anyway).
Dec 07, 2004

Thanx, I'll go there
Apr 13, 2005

me too...eventually ^_^
Apr 21, 2005

I still don't get it.
Apr 26, 2005

wow...the hardest teaser on the site
May 11, 2005

it IS the hardest...

May 21, 2005

I got the triangular part right away, but couldn't get the other part... the EASY part, now that I know what it was!
Jun 01, 2005

i got the palindromic triangle part, but dont know how to figure out triangle numbers, and wasnt sitting there for a LONG LONG time doing them and checking for palindrom-icity (yes, i made that word up)
Jun 02, 2005

i didnt get it
Jun 11, 2005

Jun 11, 2005

I realized they were all triangular numbers but couldn't figure out the correlation between them.

Nice teaser, I don't think it is so hard.
Sep 22, 2005

Orangutans forced to watch Days Of Our Lives could have aced that one. Try and think of something harder next time.
Oct 02, 2005

I got the palindrome part, ( Didnt everyone ) But I didnt see the triangular part right away.This was very hard!
(user deleted)
Oct 05, 2005

I learned triangular numbers in year 7 EASY
Oct 09, 2005

WOW!, needed 2nd cup of coffee and 40yrs of memory back to high school, but it finally came to me GREAT JOB
Oct 24, 2005

con grats on the hardest teaser

p.s. did any one get it right
Nov 07, 2005

Hardest one on site? I got this one right away as i knew half of them and so i got the pattern. Only had to do a bit of googling for the missing ones. I will admit it's brilliant though, good job!
Dec 06, 2005

don't get it...
Jan 02, 2006

I got tha palindrome part but only got the triangular number part after the hint
May 10, 2006

Oct 12, 2006

Heh .. I was trying to work out a pattern before I realized they were palindromic.

Lol................. 1,3,6,10,55,66,171
corresonds with 1,2,3,10,11,18...

Okay, maybe it's 123, 123... 1+0=1... 1+1= 2... 1+8=.. damn.

Didn't want to go down the line calculating.. so I googled palindromic triangular numbers
Nov 14, 2006

Easy, just simple....Not its the hardest one here
Jul 28, 2007

what's a triangular number?
Jan 08, 2009

Took longer to figure out what the next three palindromic triangular numbers were than it did to figure out the rule.

Pretty nice teaser, but not terribly difficult.

Mar 09, 2009

I don't understand why this one is rated so difficult?
Sep 01, 2010

Nice, fun teaser, got the answer as soon as I saw 55 and 66.

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