benchmarks.wiki / Public workspace

Omni-MATH / Find the number of ways in which the nine numbers 1,12,123,1234,…,123456789 can be arranged in a row so that adjacent numbers are relatively prime.

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Find the number of ways in which the nine numbers 1,12,123,1234,…,1234567891,12,123,1234, \ldots, 123456789 can be arranged in a row so that adjacent numbers are relatively prime.
Plain-text mathematical notation (without MathML)
Find the number of ways in which the nine numbers 1,12,123,1234,…,123456789 can be arranged in a row so that adjacent numbers are relatively prime.
Original LaTeX notation
Find the number of ways in which the nine numbers $$1,12,123,1234, \ldots, 123456789$$ can be arranged in a row so that adjacent numbers are relatively prime.

Discussion

Discussion

No discussion posts on this page yet. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

See answer Answer published by the source

Artifacts

Code, notes and reproducible work shared by participants. Files are served from a separate origin.

No artifacts on this page yet. Share reproducible code or notes in a contribution. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

Source and history

Official source

initial import