List of prime factors

The ifactors command decomposes an integer into prime factors.

ifactors takes n, an integer or a list of integers.
ifactors(n) decomposes the integer n (or the integers of the list) into prime factors, given as a list (or a list of lists) in which each prime factor is followed by its multiplicity.

ifactors(90)

⎡
⎣

2,1,3,2,5,1

⎤
⎦

since 90=2¹· 3²· 5¹.

ifactors(-90)

⎡
⎣

−1,1,2,1,3,2,5,1

⎤
⎦

ifactors(31+22*i)

⎡
⎣

i,1,2−i,1,4−i,2

⎤
⎦

ifactors([36,52])

⎡
⎢
⎣

2	2	3	2
2	2	13	1

⎤
⎥
⎦