# Doubly Recursive Integer Factorizations

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The fundamental theorem of arithmetic states that every integer greater than 1 can be factored uniquely (up to the ordering of the factors) into a product of powers of one or more primes. So denoting the primes 2, 3, 5 … as , , , …, each integer can be factored as , where and are the index and power of the prime in the factorization. For example, , or .

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After that, each index and exponent can likewise be factored: . Because the recursive process ends with all indexes and exponents as 1, the ones can be suppressed without loss of meaning, so that .

This Demonstration shows this representation of any integer factorization.

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Contributed by: Robert Dickau (September 2018)
Open content licensed under CC BY-NC-SA

## Details

Snapshot 1: the integer 2 is the first prime raised to the first power, with representation

Snapshot 2: subscript and superscript are ones displayed

Snapshot 3: hiding the subscript and superscript ones changes the order of factors due to the sorting rules in Mathematica.

Reference

[1] "Riffs and Rotes." (Aug 7, 2018) oeis.org/wiki/Riffs_and_Rotes.

## Permanent Citation

Robert Dickau

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