> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/s/sum_of_first_n_cubes.md). # Sum of first n cubes ```ruby 0..49 -> map { .faulhaber_sum(3) }.slices(5).each { .join(' ').say } ``` ## Output: ``` 0 1 9 36 100 225 441 784 1296 2025 3025 4356 6084 8281 11025 14400 18496 23409 29241 36100 44100 53361 64009 76176 90000 105625 123201 142884 164836 189225 216225 246016 278784 314721 354025 396900 443556 494209 549081 608400 672400 741321 815409 894916 980100 1071225 1168561 1272384 1382976 1500625 ``` --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://trizen.gitbook.io/sidef-lang/programming_tasks/s/sum_of_first_n_cubes.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.