Math Teachers at Play Carnival 51 at Math Mama Writes

Math Mama Writes has a staggering collection of 51 articles from the blogosphere for the 51st edition of the Math Teachers at Play Blog Carnival. I particularly liked the opening trivia about 51.

I’m a pentagonal number, 
I have just two factors, 
and if you put me in base 2, 4 or 16, 
I’m a palindrome.
I wonder:
Is there anyone else like me in the number universe?
On the other hand, the Math and Multimedia Carnival is currently dormant and will resume next month. It will be hosted by  Mathematics, Learning and Web 2.0.  You may now submit your entries at the submission form.
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