All Questions
12 questions
3
votes
2
answers
552
views
Contest Solution: Hailstones
The Problem
In the January 1984 issue of Scientific American, an interesting sequence of numbers known as a hailstone series was described. The series is formed by generating the next number ...
- 3,137
1
vote
3
answers
665
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Euler Project 14 Longest Collatz Sequence [closed]
I have been working through the euler project and I have created the following code for Problem 14, which asks which starting number, under 1 million, produces the longest Collatz Sequence chain.
It ...
- 423
4
votes
2
answers
8k
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Project Euler #14 - Longest Collatz Sequence in Python
I recently solved Project Euler Problem 14 in Python:
The following iterative sequence is defined for the set of positive
integers:
...
- 41
12
votes
2
answers
2k
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"Longest Collatz sequence" in C slower than in Python 3
This tight-looped memoization-less C solution to Project Euler's problem 14 seems efficient, but ran much slower than a similarly trivial Python 3 program. For the desired ...
- 123
5
votes
2
answers
197
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Euler Project 14 (Longest Collatz Sequence)
Project Euler 14 asks: Which starting number, under one million, produces the longest Collatz sequence?
I've been trying to optimize this solution to execute in less then 1s. Agenda for first 50 ...
- 1,012
3
votes
2
answers
617
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Efficient solution to Project Euler 14 (Longest Collatz sequence)
This is an iterative review. I asked for reviews on a Collatz sequence generator here. I tried to address all of the suggestions that were made.
I've added a new function ...
- 965
10
votes
4
answers
3k
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3n + 1 programming challenge in Python
I am trying to find a efficient solution for the 3n + 1 problem on uvaonlinejudge. The code I have uses memoization using a dictionary. I am getting a 'Time limit Exceeded' error when I submit the ...
- 201
2
votes
3
answers
2k
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Determine Collatz sequence length for given starting values
I am trying to get into the habit of solving programming puzzles in my spare time but am stuck on the first one (which I know can be for a large number of reasons, hence my posting for help). Shown ...
- 355
4
votes
1
answer
2k
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Collatz Sequence in Python
I'm trying to use Python to solve the Project Euler problem regarding the Collatz sequence. With some research online, I have come up with the code below. However, it still takes a long time to find ...
- 173
3
votes
1
answer
826
views
Project Euler #14 (Longest Collatz sequence)
A Collatz sequence for a given positive integer \$n\$ is to take half of \$n\$ if even and \$3n+1\$ if \$n\$ is odd; repeat until the value goes to \$1\$. The question is which number from 1 to 1,000,...
- 33
9
votes
1
answer
620
views
Horridly Inefficient Project Euler #14 in Python - Collatz Sequences
I created this solution a while ago, and have been going back over my problems to try to make them all more efficient. I have been stuck on this one, and have tried a few different ideas. So far, my ...
- 285
-2
votes
1
answer
9k
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hailstone sequence using recursion in python [closed]
Douglas Hofstadter's Pulitzer-prize-winning book, Gödel, Escher, Bach, poses the following mathematical puzzle:
Pick a positive integer n as the start.
If n is even, divide it by 2.
If n is ...
- 3,351