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untouchable number · Vinony

EntityQ1193504· pop 19· linked from 253 articles

untouchable number

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positive integer unexpressable as the sum of all proper divisors of any other integer

Connections

amicable numbers

figurate number

sociable number

automorphic number

International Standard Book Number

digital object identifier

binary numeral system

Categories

Arithmetic dynamics Divisor function Integer sequences

Sources

wikipedia.externallinksexternallink

Similar entities

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

deficient number

Entitydist 0.41

pseudoperfect number

Entitydist 0.41

refactorable number

Entitydist 0.45

quasiperfect number

Entitydist 0.46

betrothed numbers

Entitydist 0.47

Entitydist 0.48

Entitydist 0.50

practical number

Entitydist 0.51

additive number theory

Entitydist 0.52

highly composite number

Entitydist 0.54

table of divisors

Entitydist 0.55

multiply perfect number

Entitydist 0.59

What links here253 pages

multiply perfect number

Dedekind number

sociable number

centered polygonal number

almost perfect number

Padovan sequence

practical number

octahedral number

parasitic number

centered nonagonal number

Erdős–Nicolas number

Erdős–Woods number

hexagonal number

quasiperfect number