Skip to contents

OEIS.R

OEIS.R hexagon sticker

Access sequences from the On-Line Encyclopedia of Integer Sequences (OEIS) directly from R

OEIS is one of the world’s most valuable mathematical resources: thousands of integer sequences with formulas, comments, references, and code. It has contributed to mathematical discoveries and is cited in over 6000 articles. OEIS.R brings this data to R in a structured way, making it easy to visualize, analyze, and use in mathematical hypotheses or contributions to OEIS.

Full documentation and function reference: https://enriqueph.github.io/OEIS.R/

Installation 

# install.packages("devtools")  # if you don't have it
devtools::install_github("EnriquePH/OEIS.R")

Quick Start 

library(OEIS.R)

# Download the Fibonacci sequence (A000045)
fib <- OEIS_sequence("A000045")

# Basic info
OEIS_description(fib)
OEIS_formula(fib)

# Quick base R plot
plot(fib)

Another example: Sequence A001615 

library(ggplot2)

id <- "A001615"
x <- OEIS_sequence(id)

OEIS_ggplot(x) +
  geom_line() +
  geom_point(size = 0.5, color = "green") +
  labs(title = paste("OEIS", id, "-", OEIS_description(x)))
Plot of OEIS sequence A001615, the Dedekind psi function
Plot of OEIS sequence A001615, the Dedekind psi function

Main Features

Download and parsing of OEIS sequences (terms, description, formula, offset, etc.). Seamless integration with ggplot2 for visualization. Helper functions:

  • OEIS_description()
  • OEIS_formula()
  • OEIS_keywords()

Respects OEIS terms of use (rate limiting recommended).

Citation

To cite the OEIS.R package itself:

citation("OEIS.R")

(GitHub’s “Cite this repository” button on this repo’s page uses CITATION.cff and gives the same citation in APA/BibTeX.)

To cite an individual OEIS sequence you’ve fetched (e.g. in a paper), use OEIS_bibtex() instead:

x <- OEIS_sequence("A001615")
print(OEIS_bibtex(x), style = "Bibtex")

Contributing

Contributions are welcome! See CONTRIBUTING.md for how to set up a development environment, run the test suite, and submit pull requests.

Author

Enrique Pérez Herrero

Built with RStudio • Licensed under the MIT License