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5.6.7  List of prime factors: ifactors

ifactors has an integer (or a list of integers) as parameter.
ifactors decomposes the integer (or the integers of the list) into prime factors, but the result is given as a list (or a list of lists) in which each prime factor is followed by its multiplicity.
Input:

ifactors(90)

Output:

[2,1,3,2,5,1]

Input:

ifactors(-90)

Output:

[-1,1,2,1,3,2,5,1]

Input:

ifactor([36,52])

Output:

[[2,2,3,2],[2,2,13,1]]

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