# At 47, My Age Is a Prime Number Again =D

For some reason, I like having my age be a prime number of years. Today, I turn 47, so I get to have a prime-number-age for a whole year now. This hasn’t happened since I was 43, so I made this 47-pointed star to celebrate:

I also make birthday-stars for composite-number ages as well, just because it’s fun, and you can find at least two others on this blog, on January 12, in past years. Also, I wouldn’t want to have to wait until I’m 53 (my next prime age) to make another one of these.

At the moment, I certainly don’t feel 47. There are times when I feel twenty-two . . .

There are also times when I feel six.

At the moment, however, I feel about thirty. For that reason, I put the 47-pointed stars on the thirty faces of a rotating rhombic triacontahedron, because (a) it’s my birthday, (b) I want to, and (c) I can.

Image/music credits:

1. I created this using Geometer’s Sketchpad and MS-Paint.
2. “When Yer Twenty-Two,” by The Flaming Lips, via a YouTube posting.
3. Two panels from a Calvin and Hobbes cartoon, by Bill Watterson. (Calvin is perpetually six years old.)
4. Created using the image at the top of this post, and the program Stella 4d: Polyhedron Navigator, which is available here.

## 6 thoughts on “At 47, My Age Is a Prime Number Again =D”

1. Happy Birthday! Have a fantastic year of prime-ness! 😀

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2. Happy birthday! My 5 year old son loves this blog btw; thanks for posting all these fantastic polyhedrons and letting us know about the stella software.

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• Thank you, and please say hello to your son for me. He must be quite precocious, for I’ve never heard of someone so young having an interest in polyhedra. 🙂

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3. Happy birthday, Dr. Pi! You know how to birthday, I must say. I can tell you are in your prime!

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