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My favourite tweeter is Clifford A. Pickover. His tweets are delightfulÂ nuggets of math, physics & more. I have a copy of his fascinating The Physics Book. However, in these tweets, heÂ claims that the string **44899 first occurs in piÂ at position 44899**, counting from the first digit after the decimal point. I thought it might be interesting to check this, and to see if there are any more such ‘self-references’ in say, the first 100,000,000 digits of pi. There’s obviously 1 at position 1, which mathematicians would probably call ‘trivial’.

So my first task, is to find a way to compute pi to far more than the accuracy of math.pi in Python. A quick search of the web sent me toÂ Nick Craig-Wood’s pages on computing pi in Python using the Chudnovsky algorithm. There I foundÂ pi_chudnovsky_bs_gmpy.py.Â It needs the gmpy2 library. IÂ needed to change a line:Â *sqrtC = (10005*one_squared).sqrt()* Â (line 63) toÂ *sqrtC = gmpy2.isqrt(10005*one_squared).*

I then wrote the following quick and dirtyÂ script, which probably isn’t as efficient or as beautiful as it could be – but it got the job done! TheÂ *len(str(digits))-1* bit adds a few digits to allow for the length of the string being searched for. In the first 100,000,000 digits of pi, the numbersÂ **1,Â 16470,Â 44899, 79873884**Â are the only ones which occur at the positions they index. I didn’t do any timing, but it only took a few minutes! When I first wrote this, I overlooked the word *first* in the claim; so then I addedÂ *pistr.find(istr)* to check where the foundÂ number first occurred. Only **1**Â satisfies the requirements. The program’s output is:

Computing Pi Searching for Pickover numbers 1 first occurs at 1 16470 first occurs at 1602 44899 first occurs at 13714 79873884 first occurs at 46267046

As a ball-park check on this, go to 100,000 digits of PiÂ and use your browser’s find function to locate 44899. This number is slightly under one half of 100,000, but there’s a couple of occurrences of it well before halfway. Or better yet, go toÂ The Pi-Search Page. I’ve replied to Pickover’s tweet and emailed him to let him know the claim isn’t correct. He isÂ wrongÂ on the Internet.

**UPDATE**: He kindly responded to my email, and agrees that the claim as worded is wrong.

# Pi_ckover.py # # http://www.craig-wood.com/nick/articles/pi-chudnovsky/ import pi_chudnovsky_bs as pi digits = 100000000 print("Computing Pi") pi = pi.pi_chudnovsky_bs(digits+len(str(digits))-1) # compute pi pistr = str(pi) # convert to string print("Searching for Pickover numbers") for i in range(1, digits+1): # search along from 1 to digits istr = str(i) # convert i to string l = len(istr) # get its length if istr == pistr[i:i+l]: print(istr," first occurs at ",pistr.find(istr))

- A057680 Self-locating strings within Pi: numbers n such that the string n is at position n (after the decimal point) in decimal digits of Pi.
- The Pi-Search Page:Â The string
**44899**occurs at position 13714 - 100,000 Digits of Pi
- Cliff Pickover’s Tweets about 44899 in Pi
- 12.1 Trillion Digits of Pi

The **Chudnovsky algorithm** is a fast method for calculating the digits of Ï€. It was published by the Chudnovsky brothers in 1989, and was used in the world record calculations of 2.7 trillion digits of Ï€ in December 2009, 5 trillion digits in August 2010, 10 trillion digits in October 2011, 12.1 trillion digits in December 2013 and 22.4 trillion digits of Ï€ in November 2016.

The algorithm is based on the negated Heegner number $d=-163$, the *j*-function $\scriptstyle j\left({\frac {1+{\sqrt {-163}}}{2}}\right)=-640320^{3}$, and on the following rapidly convergent generalized hypergeometric series:

- ${\frac {1}{\pi }}=12\sum _{k=0}^{\infty }{\frac {(-1)^{k}(6k)!(545140134k+13591409)}{(3k)!(k!)^{3}\left(640320\right)^{3k+3/2}}}$

For a high performance iterative implementation, this can be simplified to

- ${\frac {(640320)^{3/2}}{12\pi }}={\frac {426880{\sqrt {10005}}}{\pi }}=\sum _{k=0}^{\infty }{\frac {(6k)!(545140134k+13591409)}{(3k)!(k!)^{3}\left(-262537412640768000\right)^{k}}}$

There are 3 big integer terms (the multinomial term *M _{k}*, the linear term

- $\pi =C\left(\sum _{k=0}^{\infty }{\frac {M_{k}\cdot L_{k}}{X_{k}}}\right)^{-1}$, where:

- $C=426880{\sqrt {10005}},\quad \quad M_{k}={\frac {6k!}{(3k)!(k!)^{3}}},\quad \quad L_{k}=545140134k+13591409,\quad \quad X_{k}=(-262537412640768000)^{k}$

The terms *M _{k}*,

- ${\begin{alignedat}{4}L_{k+1}&=L_{k}+545140134\,\,&&{\textrm {where}}\,\,L_{0}&&=13591409\\[4pt]X_{k+1}&=X_{k}\cdot (-262537412640768000)&&{\textrm {where}}\,\,X_{0}&&=1\\[4pt]M_{k+1}&=M_{k}\cdot \left({\frac {(12k+2)(12k+6)(12k+10)}{(k+1)^{3}}}\right)\,\,&&{\textrm {where}}\,\,M_{0}&&=1\\[4pt]\end{alignedat}}$

The computation of *M _{k}* can be further optimized by introducing an additional term

- ${\begin{alignedat}{4}K_{k+1}&=K_{k}+12\,\,&&{\textrm {where}}\,\,K_{0}&&=6\\[4pt]M_{k+1}&=M_{k}\cdot \left({\frac {K_{k}^{3}-16K_{k}}{(k+1)^{3}}}\right)\,\,&&{\textrm {where}}\,\,M_{0}&&=1\\[12pt]\end{alignedat}}$

Note that

- $e^{\pi {\sqrt {163}}}\approx 640320^{3}+743.99999999999925\dots$ and
- $640320^{3}=262537412640768000$
- $545140134=163\cdot 127\cdot 19\cdot 11\cdot 7\cdot 3^{2}\cdot 2$
- $13591409=13\cdot 1045493$

This identity is similar to some of Ramanujan's formulas involving Ï€, and is an example of a Ramanujanâ€“Sato series.

The time complexity of the algorithm is $O(n\log(n)^{3})$.

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