1, 3, 6, 55, 66...
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What are the next three numbers in this series?
1, 3, 6, 55, 66, 171, 595, 666, 3003, 5995, ?, ?, ?
8778, 15051, 66066
These are the 1st 13 palindromic triangular numbers.
Dec 02, 2004
|For those people who don't know what a triangular number is, http://mathworld.wolfram.com/TriangularNumber.html 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
|WOW! THAT IS HARD! |
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!|
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. |
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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