Linked Questions

29 votes
36 answers

Fibtraction - Fibonacci but with subtraction [duplicate]

The Fibtraction sequence (as I call it) is similar to the Fibonacci sequence except, instead of adding numbers, you subtract them. The first few numbers of this challenge are: ...
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  • 16.1k
5 votes
4 answers

Implement the Fibonacci sequence... Shifted to the right [duplicate]

Background We all know the famous Fibonacci sequence, where each term is the sum of the previous two, with the first term being 0 and the second one being ...
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  • 41.5k
3 votes
1 answer

Add the Fibonnaci Sequence to the Lucas Sequence [duplicate]

Background of Lucas Numbers The French mathematician, Edouard Lucas (1842-1891), who gave the name to the Fibonacci Numbers, found a similar series occurs often when he was investigating Fibonacci ...
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  • 571
-2 votes
4 answers

Calculate Fibonacci series from nth term to mth term [duplicate]

Your goal is to calculate the sum of Fibonacci series from n th term to m th term (including both terms). No use of / * % or mathematically what they are in your ...
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  • 2,655
546 votes
239 answers

Showcase of Languages

Notes This thread is open and unlocked only because the community decided to make an exception. Please do not use this question as evidence that you can ask similar questions here. Please do not ...
89 votes
208 answers

Find the Factorial!

Create the shortest program or function that finds the factorial of a non-negative integer. The factorial, represented with ! is defined as such $$n!:=\begin{...
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80 votes
192 answers

Sum of all integers from 1 to n

I'm honestly surprised that this hasn't been done already. If you can find an existing thread, by all means mark this as a duplicate or let me know. Input Your input is in the form of any positive ...
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  • 1,259
58 votes
150 answers

Evolution of OEIS

In this challenge, the goal is to recreate the On-Line Encyclopedia of Integer Sequences one sequence at a time. Similar to the Evolution of Hello World, each answer depends on a previous answer. ...
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  • 28.6k
77 votes
53 answers

Tips for golfing in Ruby

What general tips can you give for golfing in Ruby? I'm looking for ideas that can be applied to code golf problems in general that are specific to Ruby. (For example, "Remove comments" would not be ...
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  • 1,257
71 votes
56 answers

Tips for code-golfing in C#

What general tips do you have for golfing in C#? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to C# (e.g. "remove comments" is not an ...
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  • 1,783
137 votes
29 answers

Making Future Posts Runnable Online with Stack Snippets [closed]

Stack Snippets were recently added to PPCG! Reminiscent of JSFiddle, Stack Snippets allow HTML, CSS, and JavaScript to be run directly in posts! Here is a very simple Stack Snippet: ...
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54 votes
64 answers

Am I a Fibonacci Number?

Your Task: Write a program or function to check if a number that is inputted is a Fibonacci number. A Fibonacci number is a number contained in the Fibonacci sequence. The Fibonacci Sequence is ...
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  • 6,939
45 votes
69 answers


Definition Fibonacci sequence F(n), on the positive integers, are defined as such: ...
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  • 48.6k
49 votes
52 answers

Patience, young "Padovan"

Everyone knows the Fibonacci sequence: You take a square, attach an equal square to it, then repeatedly attach a square whose side length is equal to the largest side length of the resulting rectangle....
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26 votes
66 answers

1, 2, miss a few, 99, 100

When I was a kid, there was a "really cool" shortcut to count to 100: 1, 2, miss a few, 99, 100 Output the exact string above, in the fewest characters ...
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  • 4,517

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