10101...10101 (37-digits)

This number is a composite.

                                    1010101 0101010101 0101010101 0101010101

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The smallest semiprime of the form 1(01)n. Can you find another? [Silva]

Submitted: 2011-02-05 04:00:15;   Last Modified: 2011-02-11 21:02:19.
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