# Tagged Questions

This challenge involves the mathematical constant pi.

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### Runs of Digits in Pi

Your goal is to output the strictly increasing sequence of consecutive, identical digits of pi (π). Each term in the sequence must be one digit longer than the previous. So 3 (0th digit of pi) is the ...
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### Find the nth decimal of pi

There are already 30 challenges dedicated to pi but not a single one asks you to find the nth decimal, so... Challenge For any integer in the range of 0 <= n <= 10000 display the nth decimal ...
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### Happy Rounded Pi Day

To celebrate Rounded Pi Day, you must take advantage of today's date to make a program that takes in a circle's diameter and outputs its circumference by multiplying the diameter by 3.1416, where 3....
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### Pi Day, Pi Minute, or Pi Second?

In this challenge you will need to determine whether it's Pi Day, Pi Minute, or Pi Second. Because Pi is irrational, it wants your code to be as short as possible. Examples No input is provided, ...
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### Co-primality and the number pi

Introduction Number theory is full of wonders, in the form of unexpected connections. Here's one of them. Two integers are co-prime if they have no factors in common other than 1. Given a number N, ...
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### Shorten an already short mathematical expression

For once, I was doing some real work, updating old code, and bumped into an expression that is equivalent to what would be written as πx + ex in good old-fashioned math. I thought it would be possible ...
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### Map a random number to pi

A double precision representation of a decimal can only guarantee an accuracy of 15 decimal places, thus pi is approximated as: 3.141592653589793 You can see that the digit 3 is in positions 1, 10, ...
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### Pi Bowling to 10 in 10 [closed]

Your Goal: Estimate pi to at least 10 decimal places. The format is your choice - it can output as a number, as a string, as an output to STDOUT, etc. Seems easy, right? But wait, it's not as simple ...
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### Memory is Expensive [closed]

You are a robot. You are stranded in a small cage with weird humans wearing weird suits looking at you. Your solar panel is malfunctioning, and your energy is running out. On the wall there is a ...
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### Computing truncated digits sums of powers of pi

Given a positive integer n output the sum of the first n decimal digits of the fractional part of πn. Example input and outputs: 1 → 1 2 → 14 3 → ...
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### Quiche Lorraine [closed]

Since it was Pi day recently, I have noticed a number of challenges that ask you to calculate pi. Of course, a quiche lorraine is not quite a pie (you can claim a Bonus Score¹ of +1 if you guessed ...
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### Calculate π with quadratic convergence

Write a function or complete program that takes a positive number n and performs n steps of an iterative algorithm for calculating π that has quadratic convergence (i.e. it approximately doubles the ...
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### Transmit Pi… precisely

Following on from Monte Carlo estimator of Pi this challenge is to produce the shortest code for the constant Pi. Except here your code must output consecutive digits of pi forever. This is code ...
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### Monte Carlo estimator of Pi

Happy Pi Day everyone! For no reason at all, I'm trying to construct a Monte Carlo estimator of Pi that is as short as possible. Can we construct one that can fit in a tweet? To clarify, what I have ...
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### Calculate a pi-based sequence with a pi-based frequence

Introduction Pi is 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089... Let's treat each digit as an instruction as to how to get to the next digit. The first ...
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### Piem validator programme

Write a program that defines a function that can check if a string variable called "anything you want or inputted by the user" is or not a piem. (piem = a story or poem in which the word lengths ...
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### Pirrational Numbers

Pi is an irrational number, which means that its decimal representation never terminates or repeats itself. Pi truncated to 41 decimal digits (40 places) is 3.1415926535897932384626433832795028841971....
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### 5 Seconds to Find Pie

Pi times e (or Pie if you like ambiguous notation) to 100 decimal places is: 8.5397342226735670654635508695465744950348885357651149618796011301792286111573308075725638697104739439... (OIES A019609) ...
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### When is my piversary?

Since I want to celebrate this definitely not nerdy event, your job is to calculate the piversary (pi-anniversary) of a given date. Input Your code has to have a possibilty to input a date in the ...
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### Calculate the most digits of pi [closed]

There are a lot of challenges on this site regarding pi, but none that challenge you to calculate as many digits of pi as possible. As you all may know, pi in its decimal form goes on for infinity, ...
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### PI window encryption

This is a simple encryption method that uses PI digits to encode a message, the method is simple: The key is just a positive integer that indicates where the window starts then: Given a string to ...
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### Pi is still wrong [closed]

Pi is Wrong A common method of computing pi is by throwing "darts" into a 1x1 box and seeing which land in the unit circle compared to the total thrown: loop x = rand() y = rand() if(sqrt(x*...
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### Output Pi without math

In as few bytes as possible, your job is to write a program that outputs: 3.14 In celebration of a late Pi day of course! :) Rules You can do it anyway you like, but there are some restrictions. ...
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### π Day puzzle for 3/14

Happy π Day. The goal of this question is to calculate the area for a circle of radius 3, where A = πr². The catch is that you have to use the constant π that is defined in a different language than ...
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### Get as close to pi as you can [closed]

Your job is to write a program to find the closest number to PI. Let me clarify. You will first choose a number type. Let us say you choose Integer (in an actual answer, you cannot). Your program ...
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### Pi Calculation Code Golf

The Challenge You must calculate pi in the shortest length you can. Any language is welcome to join and you can use any formula to calculate pi. It must be able to calculate pi to at least 5 decimal ...
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### stupid restrictions and desert

So, you were sitting at your desk, golfing a program to calculate the first 20 digits of pi, and along comes your boss and throws your apple IIe out the window. You are now working on a new project ...
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### Solve the CodeSprint4 Leibniz code golf challenge in Python in 66 characters

Check out this challenge: https://www.hackerrank.com/codesprint4/challenges/leibniz (The competition has already ended, so I'm just curious about the Python solution, which the organizers refused to ...
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### Calculate pi to 5 decimals

This comes from http://programmers.blogoverflow.com/2012/08/20-controversial-programming-opinions/ "Given that Pi can be estimated using the function 4 * (1 – 1/3 + 1/5 – 1/7 + …) with more terms ...
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### Good rational approximations of pi

Write a program that prints out all the good rational approximations of pi with denominator < 1000000, in increasing denominator order. a/b is a "good rational approximation" of pi if it is closer ...