Yeah, this isn't known to be true. pi has not been proven to be a disjunctive number (a real number whose expansion contains all possible finite strings), let alone a normal number (where all finite strings occur with the probability you'd expect if the digits were random). Both of these, however, are generally conjectured to be true, but it's just a conjecture.

https://oeis.org/wiki/Disjunctive_numbers#Is_pi_a_disjunctiv...

https://en.wikipedia.org/wiki/Normal_number

Seen this already? https://github.com/philipl/pifs

>> all number sequences can be found within the digits of pi quite easily

> I dispute that, although I guess the general brute-force solution is 'easy' given infinite time.

Look at it this way -- if it were not true, then the digits of Pi would not be normally distributed (see https://en.wikipedia.org/wiki/Normal_number), and that would be a rather extraordinary mathematical finding.

If Pi's digits are normally distributed, then one can reliably predict the time required for finding any particular digit sequence using probability theory. And given the presumption of normalcy, that probability is the same for any digit sequence of a given length.

The probability for finding a given test digit sequence in the first 100 million digits of Pi is given here:

https://www.angio.net/pi/whynotpi.html

But it has to be emphasized that, given a finite test sequence and an infinite sequence of Pi's digits as a search space, the probability is 1.0.

If both work, and the one interpretation overlaps and is an international standard, who cares?

Maybe that day can be written 2017-π to preserve both the pun and (if not the letter) the spirit of ISO notation. In that sense, it's Pi day for a given year.

Pi Day is the same in Drunk Endian (US) and Big Endian (ISO Standard) formats (March 14th). It's different in Little Endian (Traditional European) format.

And, in the ISO format, when omitting the year, it's still 3-14.

I assume you have the luxury of an unambiguous birthday (eg. 01-13). I imagine if I wrote 11-12 on a form without regard to what the specific spaces say, it would be regularly misinterpreted in the US.