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happy number

numbers with a certain property involving recursive summation
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happy number

Summary

happy number ranks in the top 2% of general entities by monthly Wikipedia readership (387 views/month).[1]

Key Facts

  • happy number's subclass of is recorded as positive integer[2].
  • happy number's Freebase ID is recorded as /m/02ncbn[3].
  • happy number's OEIS ID is recorded as A007770[4].
  • happy number's defining formula is recorded as n\geq10^{m-1}>81m[5].
  • happy number's MathWorld ID is recorded as HappyNumber[6].
  • happy number's Rosetta Code page ID is recorded as Happy_numbers[7].
  • happy number's maintained by WikiProject is recorded as WikiProject Mathematics[8].
  • happy number's Microsoft Academic ID is recorded as 99064304[9].

Why It Matters

happy number ranks in the top 2% of general entities by monthly Wikipedia readership (387 views/month).[1] It has Wikipedia articles in 23 language editions, a strong signal of global cultural recognition.[10] It is known by 10 alternative names across languages and contexts.[11]

References

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

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . Freebase Data Dumps. wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [10] ↑ . Wikidata sitelinks. wikidata.org.
  3. [11] ↑ . 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). happy number. Retrieved April 11, 2026, from https://4ort.xyz/entity/happy-number
MLA “happy number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Apr. 2026, https://4ort.xyz/entity/happy-number.
BibTeX @misc{4ortxyz_happy-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{happy number}}, year = {2026}, url = {https://4ort.xyz/entity/happy-number}, note = {Accessed: 2026-04-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): happy number — https://4ort.xyz/entity/happy-number (retrieved 2026-04-11)

Canonical URL: https://4ort.xyz/entity/happy-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. 16d ago · KrBot bot · 2026-05-06 view diff on Wikidata ↗
    Aliases → —
    Maintained by wikiproject → WikiProject Mathematics
    Subclass of → —
    Subclass of → positive integer
    "/* wbsetclaimvalue:1| */ [[Property:P279]]: [[Q16317911]], разрешение перенаправления / resolving redirect [[Q28920044]] → [[Q16317911]] ([[:toollabs:editgroups/b/KrBotResolvingRedirect/Q28920044_Q163"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.