how to find the smallest taxicab number or Ramanujan number like 1729 larger than N?

2 次查看（过去 30 天）
Daniel Niu
Daniel Niu 2022-10-24
评论： Daniel Niu 2022-10-24
I write a .m file to find the a b c d of a taxicab number. The program run well when the num=1729 or some other taxicab number.
But when the num is not a taxicab, the program reture a empty.
I want to know how to find the smallest number large than for example 40000 and find the a b c d
And how to find the first few of taxicab number?
a^3+b^3=c^3+d^3
Your help would be highly appreciated!
clear
format long
num=1729;
b = 1:(num)^(1/3);
a = (num-b.^3).^(1/3);
condition=round(a,10)==round(a,5);
terms = find(condition);
taxicab=round(a(terms));

请先登录，再回答此问题。

采纳的回答

David Hill
David Hill 2022-10-24
There are so few taxicab numbers that you should just use a lookup table.
l=["2", "1729", "87539319", "6963472309248", "48988659276962496", "24153319581254312065344"];
  3 个评论
显示 1更早的评论

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Biological and Health Sciences 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by