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
Tue Dec 13 15:17:44 CET 2011 [seqfan] Re: Meanings
Tue Dec 13 15:04:38 CET 2011 [seqfan] Re: Meanings
Wed Feb 16 21:21:33 CET 2011 [seqfan] Re: multiplicative set-like sequences
Thu Aug 19 14:49:14 CEST 2010 [seqfan] Re: 1 is square (square of unit 1) but is not squareful (i.e. it is squarefree, no repeated primes in its prime factorization)
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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