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Search: id:A065428
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| A065428 |
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Numbers n such that all x^2 mod n are nonprimes. |
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+0
2
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| 1, 2, 3, 4, 5, 8, 12, 15, 16, 24, 28, 40, 48, 56, 60, 72, 88, 112, 120, 168, 232, 240, 280, 312, 408, 520, 760, 840, 1320, 1848
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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All numbers in this sequence except 56 are idoneal (A000926) - Joerg Arndt (arndt(AT)jjj.de), Jul 13 2005
No more terms < 10^6. - T. D. Noe (noe(AT)sspectra.com), Aug 10 2007
No more terms < 10^11. [From Charles R Greathouse IV Dec 15 2008]
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LINKS
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Joerg Arndt, Fxtbook
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MATHEMATICA
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t={}; Do[s=Union[Mod[Range[n]^2, n]]; If[Select[s, PrimeQ]=={}, AppendTo[t, n]], {n, 1000}]; t - T. D. Noe (noe(AT)sspectra.com), Aug 10 2007
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CROSSREFS
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Sequence in context: A053021 A122700 A048486 this_sequence A059747 A094087 A017821
Adjacent sequences: A065425 A065426 A065427 this_sequence A065429 A065430 A065431
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KEYWORD
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nonn,nice,more
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AUTHOR
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Joerg Arndt (jj(AT)suse.de), Nov 16 2001
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