Decimal to Tribonacci to Binary to Decimal number-theorynumberfibonaccicode-golf Background The Tribonacci Sequence Imagine for a second that you could make a fibonacci sequence by replacing the standard iteration formula with the following: Basically, instead of summing the last two to ...

A simple but hopefully not quite trivial challenge. Sum the powers that be Write a program or function that adds up the kth powers of a number n. More specifically: Input: two positive integers n and k (or an ordered pair of integers, etc.) Output: the sum of all of the positive divisors of n...

ACME (Let's Encrypt) client cryptography networking code-golf A list of ACME clients already looks a bit like a PPCG leaderboard, but I don't see the typical esolang roster there. The task is in minimum number of bytes get the certificate for specified domain (assuming running from a directory...

One of the more popular suggestions from We're not a Q&A site. But what should be done about it? was to change the search bar's placeholder text. We've been asked to flesh this out in a separate feature request so that SE can look into whether they'll make these changes for us. So you don't have...

I only very recently discovered code golf and just found this part of the Stackexchange network, and naturally after looking at so many clever answers, I feel inferior. Inner me knows I'll get better over time, but inner me is also vain and needs validation. At the same time, I don't take kindly...

Smallest number unprintable in 100 bytes or less This is a cops-and-robbers challenge: a "cop" entry represents an individual challenge that's meant to be unsolvable, and a "robber" entry an attempt to prove that the challenge is, after all, solvable. In this particular case, the smaller challen...

Your objective is to write a program which prints the previous (in chronological order) answer's source code to console, standard out, or your language's equivalent. That means it's not a quine per se, but uses the concept of printing source code. Try to be as creative as possible with your answ...

Write a quine, that when run, creates itself, in a source file named itself. We will be using Windows in this, so the file name (and therefore quine) must have the following limitations: None of these characters \ / : ? * : < > | Below 211 characters Your code must be a full program (It's goi...