Use digits in the place of letters to solve the above equation. Each letter represents different digit.

Very interesting puzzle! On 3 occasions I thought I found the answer…and then found a better solution. Hope I’ve finally got it right…

Source: A puzzle group on internet

Today is **National Pi Day** (March 14th or 3/14). I had written a blog post on **National Pi Day** in 2009 which you can read here (the blog post was imported from my old blog and there seems to be some loss of content or distortion of metadata). I joined Twitter on 13th March 2009, just a day before the 2009 National Pi Day when I wrote that blog post. So I was hardly conversant with Twitter and hadn’t checked Pi Day messages. In fact Twitter itself was new at that time, so I doubt if there was much content around Pi Day.

Anyways, since then I have been following National Pi Day messages on Twitter every year and also on other social media.

So this year I thought of posting a collection of few interesting messages related to “Pi”.

Prof. Arthur Benjamin is a well known Maths professor who has combined Mathematics and Magic through his program Mathemagic. All mathematicians find “Pi” intriguing and they like to explore various aspects of Pi. Prof. Arthur has composed a nice song on Pi which I recently saw on Youtube. Here is the song:

Matt Parker is another Math enthusiast who has several interesting videos on Mathametics on Youtube channel Numberphile. As we know Pi is an irrational number. It doesn’t end and goes on and on. As of now researchers have found out up to 2.7 trillion digits of Pi. That is 2,000,000,000,000,000th digit of Pi!

Coming back to Mike Parker…he printed first million digits of Pi and laid down along a mile strip on airport! He also discussed interesting points about Pi. Here is the video:

A comment on this video summarized the exercise pretty well. It said “**Completely unnecessary, but absolutely awesome!!**”

Here are some interesting messages on Pi and Pi Day.

Pi looks as “PIE” in mirror

Humorous take on Pi – the “irrational number”

Today’s Google Doodle and message on Twitter handle of Google India. There was speculation on what the text message means. One possibility could be the next Android version (version P) could be named “Pi”

Unfortunately today’s Pi Day began with the sad news of demise of great theoretical physicist Dr. Stephen Hawking. Interestingly enough Pi Day also happens to be birthday of another great theoretical physicist, Dr Albert Einstein (or as a funny tweet called him, [mc^2-instein] ). And many people on twitter talked about this coincidence.

Then as usual, there were several offers celebrating Pi Day and offering things for $3.14

Here is a funny dialog between the “imaginary” number “i” and “irrational” number “pi”

And lastly, here is a funny cartoon on Pi being the lonely number 🙂

Humor for #PiDay Pi Day.

Question: “What did the palindrome and math lover say when she was offered cake?” Answer: “I prefer pi.”

Indian genius mathematician Srinivas Ramanujan had special affinity for Ramanujan. Lot of his equations involved “Pi” in very elegant and artistic manner. Here are a couple of examples:

I have few more resources on magnificent “Pi”, but will save it for the next year…till then Happy Pi Day!

Pink shaded region in above square is what % of area of the square?

Hint: You do not have to know the side of the square to solve this.

Here are three puzzles related to “2018”. Interesting ones with varying difficulty. Do try and post answers

This New Year crosses 2 years that are the sum of 2 squares: 2017=9²+44², 2018=13²+43².

There was a triple of such years in 1960-1962 but there won’t be again until 2248-2250.

From Twitter

Year end is about holidays and New Year wishes. But it is also about Calendars. I don’t know about others but I like to “read” new calendar, immediately check few dates or events, festivals!

I remember having written a couple of blog posts about Calendar. One, written in 2007, was a light take on Calendar – Calendar विषयी थोडेसे… (It’s in Marathi)

The other was written in 2010 about the mathematics behind the Calendar, or how to calculate day of any date. I was not able to find it in Archive – probably it got lost when I imported my old blog into this domain. So posting it here again. It was written on 13th February 2010:

Few years ago I was learning a programming language and was given an assignment to display calendar and tell day of date .

- There are 365 days in a normal year and 366 in a Leap year.
- If the year is divisible by 4 (but not by 100) then the year is a Leap year e.g. 1988, 1876, 2024 etc.
- If the year is divisible by 100 and also by 400 then the year is a Leap year. e.g. 2000, 1600, 2400.
- If the year is divisible by 100 but not by 400, then the year is NOT a Leap year. e.g. 1800, 1900, 1700, 2100 etc.

- January – 3
- February – 0
- February in a Leap year – 1
- March – 3
- April – 2
- May – 3
- June – 2
- July – 3
- August – 3
- September – 2
- October – 3
- November – 2
- December – 3

**4 odd days**

**4 odd days**

**2 odd days**

**1 odd day**

**Friday**.

**Friday**!

**0 odd days**

**1 odd days**

**5 odd days**

**4 odd days**

**Tuesday**!

**0 odd days**

**2 odd days**

**4 odd days**

**5 odd days**

**Wednesday**!

**5 odd days**

**6 odd days**

**4 odd days**

**4 odd days**

**Saturday**.

**Saturday**!

**3 odd days**

**3 odd days**

**3 odd days**

**6 odd days**

**Sunday**! 🙂

Let’s update this for today’s date i.e. 27th December 2017.

**2 odd days**

**5 odd days**

**5 odd days (26 mod 7)**

**6 odd days (27 mod 7)**

**Wednesday**! 🙂

**A Tale of Two Calendars**

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