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friendly number · Vinony

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EntityQ1707307· pop 13· linked from 227 articles

friendly number

natural number sharing its abundancy index with at least one other number

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Divisor function Integer sequences Unsolved problems in number theory

Sources

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amicable numbers

Entity

figurate number

sociable number

automorphic number

rational number

digital object identifier

binary numeral system

International Standard Serial Number

greatest common divisor

three-dimensional space

natural language

composite number

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Similar entities

Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).

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What links here227 pages

amicable numbers

centered pentagonal number

Dedekind number

octahedral number

sociable number

almost perfect number

Padovan sequence

practical number

untouchable number

centered polygonal number

parasitic number

hexagonal number

quasiperfect number

Erdős–Nicolas number

centered nonagonal number

Erdős–Woods number

perfect totient number

triangular number