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Farm Dog

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.

 

Puzzle ID:#25004
Fun:** (2.04)
Difficulty:*** (2.85)
Category:Trick
Submitted By:cnmne*us*****

 

 

 



The numbers 2 and 5 are the only two prime numbers that end in 2 or 5. What is the rationale for the following groups of numbers?

3 17 31 47 61
7 19 37 49 67
11 23 41 53 71
13 29 43 59 73




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Comments

deepseaAus*
Aug 01, 2005

the title gave it away
SaturnCat08*
Aug 01, 2005

Good One!
SaturnCat08*
Aug 01, 2005

Good One!
SaturnCat08*
Aug 01, 2005

Good One!
gorillazgirl*de*
Aug 01, 2005

cool
froggyggAus*
Aug 02, 2005

Good teaser!
lisha_kc*de*
Aug 03, 2005

how did the title give it away????
And was the 2 and 5 thing suppose to throw me off???
aw well...good one!
cnmne*us*
Aug 03, 2005

The 2 and 5 comment was meant to be misdirecting, hence Trick being the category. Additionally, 49 is not a prime number, again meant to be misdirecting. As for the title, it points to the children's song, where a farmer had a dog named Bingo.
thecowancannons**
Aug 04, 2005

not bad
RiddlermanAen*
Aug 08, 2005

ratio-what?
turtlesrock44*
Aug 22, 2005

????????????????
swithieAgb*
Sep 05, 2005

My head hurts
amelia639*
Sep 16, 2005

i couldn't get it because i don't now what rationale means
bhssoccer23Aus*
Sep 20, 2005

rationale means reason
i would have gotten it if i knew my bingo numbers!
JessicaGAau*
Oct 12, 2005

a goodish teaser, but impossible if you don't know bingo numbers
shenqiangAcn*
Oct 19, 2005

What's a bingo number?
rkaalandAus*
Dec 09, 2005

I got it!!! Only after I looked at the answer Good job!
lukeschettAus*
Jan 25, 2007

Great.
reptile5000Aus*
Jun 15, 2007

should be in another category, i think
annvie9*us*
Mar 31, 2008

got me there! (I post that to a lot of teasers )
Calehay*
Oct 31, 2008

Oh, I got it! I haven't played Bingo in ages and forgot all the rules, but I got it somehow.

For those that were wondering, Bingo is a game. http://en.wikipedia.org/wiki/Bingo_(U.S.)

The title refers to the children's song:

"There was a farmer and a dog, and Bingo was his name-O;
B-I-N-G-O, B-I-N-G-O, B-I-N-G-O,
and Bingo was his name-O."

However, "a farmer" is sometimes replaced with " a man who" so there's the stem of the confusion.
coolkcoolk*us*
Oct 27, 2009

great one! had no idea

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