**Powerful numbers, definition (1): if a prime p divides n then p^2 must also divide n (also called squarefull, square-full or 2-full numbers).**

*1, 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 72, 81, 100, 108, 121, 125, 128, 144, 169, 196*

*4 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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