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hemiperfect number

number with a half-integer abundancy index
Class type of: even number Q3281256

Facts

4 properties
Instance of
type of natural numbers
Subclass of
even number
Defining formula
\sigma(m)/m = k+\frac{1}{2}
In defining formula
m, k, \sigma(m)
🏷️ Also known as
en hemiperfect number es Número hemiperfecto fr nombre hémiparfait hu féltökéletes szám ko 절반완전수 ro număr hemiperfect ru Гемисовершенные числа sv Hemiperfekt tal uk Гемідосконалі числа zh Hemiperfect數 zh-hans Hemiperfect数
🔖 Identifiers · 2
Freebase ID
/m/0ll24_x
OEIS ID
A159907

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🔗 Connections
Subclass of 1
even number
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Summary

hemiperfect number is a type of natural numbers[1]. It is a type of even number[2].

References

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

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. 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). hemiperfect number. Retrieved November 10, 2026, from https://4ort.xyz/entity/hemiperfect-number
MLA “hemiperfect number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Nov. 2026, https://4ort.xyz/entity/hemiperfect-number.
BibTeX @misc{4ortxyz_hemiperfect-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{hemiperfect number}}, year = {2026}, url = {https://4ort.xyz/entity/hemiperfect-number}, note = {Accessed: 2026-11-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): hemiperfect number — https://4ort.xyz/entity/hemiperfect-number (retrieved 2026-11-10)

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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. 26w ago · MatSuBot bot · 2026-05-09 view diff on Wikidata ↗
    Subclass of → even number
    Instance of → type of natural numbers
    "Changed qualifier: Symbol represents: positive integer, fix redirect positive integer → positive integer (details)"
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