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Omni-MATH / For every n∈N let d(n) denote the number of (positive) divisors of n. Find all functions f:N→N with the following properties: [list][*] dleft(f(x)right) equal x for all x∈N. [*]… · Discussion

Discussing For every n∈N let d(n) denote the number of (positive) divisors of n. Find all functions f:N→N with the following properties: [list][*] dleft(f(x)right) equal{} x for all x∈N. [*]… · Omni-MATH

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