14
This number is a composite.
Just showing those entries submitted by 'Honaker': (Click here to show all)
14 = 2*7 -> 2147 = 19*113 -> 192147113 =
857*224209. Note that each new semiprime begins and ends
with the ordered factors of the previous one. Can you find a larger
chain? See PC1807. [Honaker]
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