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A055578
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"Non-generous primes": primes p whose least positive primitive root is not a primitive root of p^2.
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10
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OFFSET
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1,1
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COMMENTS
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For r a primitive root of a prime p, r + qp is a primitive root of p: but r + qp is also a primitive root of p^2, except for q in some unique residue class modulo p. In the exceptional case, r + qp has order p-1 modulo p^2 (Burton, section 8.3).
No other terms below 10^12 (Paszkiewicz, 2009).
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REFERENCES
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David Burton, Elementary Number Theory, Allyn and Bacon, Boston, 1976, first edition (cf. Section 8.3).
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LINKS
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FORMULA
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MATHEMATICA
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Select[Prime@Range[7!], ! PrimitiveRoot[#] == PrimitiveRoot[#^2] &] (* Arkadiusz Wesolowski, Sep 06 2012 *)
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CROSSREFS
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KEYWORD
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hard,nonn,bref,more
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AUTHOR
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Bernard Leak (bernard(AT)brenda-arkle.demon.co.uk), Aug 24 2000
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EXTENSIONS
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a(3) from Stephen Glasby (Stephen.Glasby(AT)cwu.EDU), Apr 22 2001
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STATUS
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approved
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