Today is my birthday! This is the second and (barring any miraculous advances in medical science) final time that my age will be a perfect number. Unfortunately, the first time my age was a perfect number, I didn’t know what a perfect number was.

- algorithm algorithms approximation arithmetic art Babylonian beauty binary binomial coefficients birthday book review bracelets carnival Carnival of Mathematics change chess chess board combinatorics complex consecutive cookies counting decadic decimal derivatives diagrams divisibility divisors education expansion factorization fibonacci floor foundations fractal fractions game games GIMPS graph graphs Haskell history humor hyperbinary idempotent integers interactive irrational Ivan Niven lehmer lucas MaBloWriMo Mersenne number numbers permutations pi prime primes problem programming proof puzzle random rectangles repunit review sequence squares symmetry test triangular video visualization
### Blogroll

### Fun

### Reference

### Categories

- algebra (39)
- arithmetic (59)
- books (25)
- calculus (6)
- challenges (47)
- combinatorics (8)
- complex numbers (5)
- computation (54)
- convergence (9)
- counting (28)
- famous numbers (62)
- fibonacci (14)
- fractals (12)
- games (17)
- geometry (29)
- golden ratio (8)
- group theory (3)
- humor (6)
- induction (7)
- infinity (17)
- iteration (39)
- links (71)
- logic (6)
- meta (37)
- modular arithmetic (34)
- number theory (71)
- open problems (11)
- paradox (1)
- pascal's triangle (8)
- pattern (54)
- people (19)
- pictures (28)
- posts without words (3)
- primes (47)
- probability (5)
- programming (17)
- proof (43)
- puzzles (10)
- recursion (8)
- review (17)
- sequences (26)
- solutions (25)
- teaching (9)
- trig (3)
- Uncategorized (2)
- video (18)

### Archives

- November 2015 (25)
- August 2015 (3)
- June 2015 (2)
- April 2015 (1)
- May 2014 (1)
- December 2013 (1)
- October 2013 (1)
- July 2013 (1)
- June 2013 (1)
- May 2013 (1)
- April 2013 (3)
- March 2013 (3)
- February 2013 (2)
- January 2013 (5)
- December 2012 (3)
- November 2012 (4)
- October 2012 (5)
- September 2012 (1)
- August 2012 (4)
- July 2012 (1)
- June 2012 (6)
- May 2012 (2)
- April 2012 (3)
- March 2012 (1)
- February 2012 (4)
- January 2012 (5)
- December 2011 (1)
- November 2011 (7)
- October 2011 (4)
- September 2011 (6)
- July 2011 (2)
- June 2011 (4)
- May 2011 (5)
- April 2011 (2)
- March 2011 (4)
- February 2011 (1)
- January 2011 (1)
- December 2010 (1)
- November 2010 (4)
- October 2010 (2)
- September 2010 (1)
- August 2010 (1)
- July 2010 (1)
- June 2010 (2)
- May 2010 (3)
- April 2010 (1)
- February 2010 (6)
- January 2010 (3)
- December 2009 (8)
- November 2009 (7)
- October 2009 (3)
- September 2009 (3)
- August 2009 (1)
- June 2009 (4)
- May 2009 (5)
- April 2009 (4)
- March 2009 (2)
- February 2009 (1)
- January 2009 (7)
- December 2008 (1)
- October 2008 (2)
- September 2008 (7)
- August 2008 (1)
- July 2008 (1)
- June 2008 (1)
- April 2008 (5)
- February 2008 (4)
- January 2008 (4)
- December 2007 (3)
- November 2007 (12)
- October 2007 (2)
- September 2007 (4)
- August 2007 (3)
- July 2007 (1)
- June 2007 (3)
- May 2007 (1)
- April 2007 (4)
- March 2007 (3)
- February 2007 (7)
- January 2007 (1)
- December 2006 (2)
- October 2006 (2)
- September 2006 (6)
- July 2006 (4)
- June 2006 (2)
- May 2006 (6)
- April 2006 (3)
- March 2006 (6)

### Meta

Happy Birthday!

Happy birthday! (Dang, you’re young!)

Happy perfect bday! I just realized that I’m the same age… guess that makes us both perfect :D

Another cool thing about your 28th birthday is that the day of the week is also the same as your original birthday. The day of your birthday changes by 1 each year, or by 2 in leap years. With 28 years and 7 leap years, that results in a change (mod 7) of 0, or the same day.

Unlike a perfect number, you do have a chance of reaching your 56th and 84th birthdays to have this happen again…

Happy birthday!

And in its form 1/10/10, today’s date is a binary number — in a sense (http://www.exploringbinary.com/binary-dates-in-2010-and-2011/ ).

Happy 28th!

Happy Birthday..

Nice being perfect, but alas, you will never (also barring medical miracles) be a double-exponent age again (3^3).

Pingback: Perfect Anniversaries « Newton Excel Bach, not (just) an Excel Blog

Happy birthday Brent!

I was excited at my last birthday because my age is now a perfect square. My next birthday, alas, won’t be all that interesting.

Nick: Your claim is provably false: there are no uninteresting ages! Proof: if there were, there would be a smallest uninteresting age. Which would be rather interesting. ;-)

I don’t know, … 1729 seems like it would be a most uninteresting age, if I were to live that long!

Well 1729 was 281 years ago, and 281 (according to Wikipedia) is “prime, twin prime with 283, Sophie Germain prime, sum of the first fourteen primes, sum of seven consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53), Chen prime, Eisenstein prime with no imaginary part, centered decagonal number”

So that’s pretty interesting, isn’t it?

Wikipedia also had some story about a guy in hospital being visited in their article about 1729, but it didn’t look very interesting, so I didn’t read it ;)

Hehe. =)

God, and I thought I talked about numbers a lot. You all just drew circles around me.

Enjoy your “perfect number” year.