191
This number is a prime.
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The lesser in the largest known twin prime pair of the form
n*2^(n-1) +/- 1. [Honaker]
Submitted: 2013-05-04 16:11:10; Last Modified: 2016-07-23 23:14:30.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell