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Old 2018-12-16, 00:17   #113
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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Yes, there are many more; I've seen duplicates in other classes before. (Because there are similarly different ways to write values, e.g. using Phi(), or gcd() ... for primitive parts or Aurifeuillean parts. PRP owners should better have an in-take evaluator and checker.

The bracketed form is hard to search for. You can use "x^?+y^?" and then filter, but that's not the first form that comes to mind.
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