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| Hi Jane, This is a new term to me. I searched the web and the only definition I could find was at  
 Thus for example 54 has factor strings $6 \times 9$ and $3 \times 18$ and $2 \times 3 \times 9$ and more.It seems as is 1 is never listed as a factor. I hope this helps, | ||||||||||||
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|   Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. | ||||||||||||