# π=80

A few unrelated questions around π…

• Why is it true that  π=80?
• Why on Earth did we define ﻿π as we did, instead of giving a nice symbol to 2π? Life would be much easier… So many less factors 2 in our books… A quadrant would be just  π/4, not the nonsensical π/2… Can you see any notational advantage? Read this for more info.
• Do you recognize this sequence: 3, 7, 15, 1, 292, 1, 1, 1, 2, 1, 3, 1, 14, 2, 1, 1, 2, 2, 2, 2, …?
• Why should I have posted this yesterday?

OK, let’s keep it short. And thanks to S.N. Santalla…

Update (March 17) My birthday date appears at position 45,260,128 of π, not counting the initial 3. When was I born? ;) Hint. (Via Pepe Aranda) Moreover: possession of all digits of π makes you infringe all known copyright laws… Do you know why?

## 7 thoughts on “π=80”

1. * yes
* is easier for a teacher to a multiple-choice test by removing a 2 in any response
* yes (after looking for it in internet)
* i’d rather not answer that

2. OK, at least we got some answers… :)

3. π=80, this might be the hardest… Here is a hint: Στο ελληνικό σύστημα αρίθμησης έχει αριθμητική αξία π´=80.

4. – the symbol π meant 80 to the Greeks.

– continued fraction for π
– I presume you should have posted it at shortly after 1:59:26 “yesterday”

5. Yes, you’re right :)

6. Maybe it´s too late to add something to this discussion, but a reasonably recent paper (01-Apr-2009) by R.J Scherrer on the variation of the value of Pi and its implication on space-time physics can be found in
http://arxiv.org/abs/0903.5321
Really interesting, though some of its conclussions must be handled with care.

7. Hi, Ricardo! Of course it’s not too late for discussion… And I’ve enjoyed a lot the paper that you suggest, it’s really funny!! :) This guy has a very nice sense of humour! XD