# PiPrints

Pi is an irrational and transcendental number (most real numbers are.) But pi is a special number---one of a few (O(1)?) that fascinate us. We invoke pi throughout our mathematical models of the physical world, not just in geometry. And yet pi contains in it an infinite length of digits. We cannot entirely grasp its whole, except through an abstraction in the form of a single greek letter.

Using clever algorithms and simple code [1], one can calculate many digits of pi. On modern computing hardware, it is a quick task to generate tens of thousands of digits of pi. When they are printed on an impact printer with 132 columns and 6 rows per inch, those digits begin to stretch to feet.

# Big pi series

## pi^2

Large dot matrix digits of pi. Each "dot" in the matrix is an individual printed number of pi.

Qume Sprint 11/55 daisy wheel printer, Prestige Elite 12 ASCII typeface, polymer ribbon

April 2022

## Euler's pi

Large dot matrix digits of pi. Each "dot" in the matrix is an individual printed numeric character of Euler's number, *e*. [2]

Qume Sprint 11/55 daisy wheel printer, Prestige Elite 12 ASCII typeface, polymer ribbon

April 2022

## DEC pi^2

Dot matrix pi printed with a dot matrix printer.

DECWRITER II terminal, cloth ribbon, green bar paper

May 2022

# Digits of pi series

September 2021

## 15840 digits of pi

20 inches of a full sheet width of pi

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

## Pi, masked

14118 digits printed around the greek letter pi rendered in Computer Modern

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

## 2pi or not 2pi

A circle inscribed in 11436 digits of pi and its logical inverse, 4536 digits of pi printed in a circle

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

## tan pi and tan^-1 pi

A large circle with 7842 digits of pi printed around it, and the inverse text, a circle of 7602 digits of pi

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

## Ones and zeros

Ones and zeros in the first 7602 digits of pi printed in a circle

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, polymer ribbon

## Apple pi

6571 digits of pi

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

DECWRITER II, green bar paper, December 2021

## Claude Shannon's Apple

The occurrences of 1 and 0 in the first 6571 digits of pi

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, polymer ribbon

## American pi

8737 digits of pi in the form of the US flag

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, cloth ribbon

## Imperfect pi

7128 digits of pi with variations caused by the printer ribbon

Diablo Advantage/25 daisy wheel printer, Pica-10 typeface, re-inked cloth ribbon

# References

- S. Rabinowitz, Abstract 863-11-482: A spigot algorithm for π, Abstracts Amer. Math. Society 12 (1991) p. 30; S. Rabinowitz, S. Wagon, A Spigot Algorithm for the Digits of π, The American Mathematical Monthly, Vol. 102, No. 3. (Mar., 1995), pp. 195-203.
- Robert Nemiroff and Jerry Bonnell, The Number e to 1 Million Digits,
`https://apod.nasa.gov/htmltest/gifcity/e.1mil`

, retrieved 1 May 2022.