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Carmichael number

composite number in number theory
Thing type_of_integer Q849530
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Carmichael number

Summary

Carmichael number is a type of integer[1]. It draws 1,390 Wikipedia views per month (type_of_integer category, ranking #11 of 70).[2]

Key Facts

  • Carmichael number's instance of is recorded as type of integer[3].
  • Robert Daniel Carmichael is named after Carmichael number[4].
  • Carmichael number is a type of Fermat pseudoprime[5].
  • Carmichael number is a type of Knödel number[6].
  • Carmichael number's maintained by WikiProject is recorded as WikiProject Mathematics[7].

Body

Definition and Type

Carmichael number's instance of is recorded as type of integer[3]. Recorded subclass of include Fermat pseudoprime[5] and Knödel number[6].

Origins

Robert Daniel Carmichael is named after Carmichael number[4].

Why It Matters

Carmichael number draws 1,390 Wikipedia views per month (type_of_integer category, ranking #11 of 70).[2] It has Wikipedia articles in 21 language editions, a strong signal of global cultural recognition.[8] It is known by 37 alternative names across languages and contexts.[9]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [8] ↑ . Wikidata sitelinks. wikidata.org.
  3. [9] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Carmichael number. Retrieved May 3, 2026, from https://4ort.xyz/entity/carmichael-number
MLA “Carmichael number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/carmichael-number.
BibTeX @misc{4ortxyz_carmichael-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Carmichael number}}, year = {2026}, url = {https://4ort.xyz/entity/carmichael-number}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Carmichael number — https://4ort.xyz/entity/carmichael-number (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/carmichael-number · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 6d ago · VGMaintenanceBot bot · 2026-09-08 view diff on Wikidata ↗
    Subclass of → Fermat pseudoprime, Knödel number
    Instance of → —
    Maintained by wikiproject → WikiProject Mathematics
    Named after → Robert Daniel Carmichael
    + 4 other properties edited (see Wikidata diff for full list)
    "/* wbsetqualifier-add:1| */ [[Property:P9675]]: 9115, Add qualifier to Rosetta Code page ID `Carmichael_3_strong_pseudoprimes`"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.