Abstract
Let p be a prime and let
for some positive
Funding source: National Science Foundation
Award Identifier / Grant number: DMS-1201442
Award Identifier / Grant number: DMS-1501982
Funding source: Russian Foundation for Basic Research
Award Identifier / Grant number: 14-01-00332
Funding statement: The first author is supported in part by the National Science Foundation grants DMS-1201442 and DMS-1501982. The third author is supported by grant RFBR 14-01-00332.
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