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quadrilateral numbers? (are there such things?)

The answer to the riddle is not quadrilateral numbers.

However, there is such a thing, or things shall I say. We have two types of quadrilateral numbers, the square numbers & the oblong numbers.

http://www.cs.utk.edu/~mclennan/BA/JO-TAT2.txt

Both type belong to the meta-set called figurate or polygonal numbers (now under discussion in the Katabatak thread :confused: )

 

PS Here is the gnomon for square numbers to 33 iterations:

http://hypography.com/gallery/showimage.php?i=624&c=3&userid=796

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Strange numbers??

 

Not Strange Numbers.

 

Here's the recap so far: :shrug:

Riddle:

I am the one made of two that makes one of six and two of five and two of four plus one four more.

 

Clues:

Two word answer

answer is a shape

The shape is a plane figure

Hypography has an entire thread dedicated to the topic

Esoteric knowledge

 

Wrong guesses:

An equilateral triangle

Strange Numbers

a circle

tetrahedron

quadrilateral number

square

parallelogram

points on a graph

family members

line

right angle

clock

time

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Why yes, it is. :) The vesica piscis is the one shape made of two intersecting circles at 120° which makes one star hexagon, two star pentagons, two squares, and one rectangle. :shrug:

Vesica Piscis Thread

 

Learnin to learn has learnt something to learn. :eek2: Nicely done.:cup:

Yes, good job there Learnin to learn. That one had several of us members scratching our heads alright. And also Mr. Turtle, excellent riddle but I really shouldn't be surprised at all because you always seem to come up with a good one for us to ponder.........................Infy
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