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.
Is there anyone else like me in the number universe?