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Search: id:A045924
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| A045924 |
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Numbers n such that prime(n) == -1 (mod n). |
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+0
16
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| 1, 2, 3, 4, 10, 70, 72, 182, 440, 1053, 6458, 6461, 6471, 40087, 40089, 251737, 251742, 637320, 637334, 637336, 1617173, 4124466, 10553445, 10553455, 10553569, 10553570, 10553574, 10553576, 10553819, 10553829, 27067100, 27067262
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Labos, E. Graph of first 50000 terms
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EXAMPLE
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10 is a member because the 10th prime, 29, is congruent to -1 mod 10.
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MATHEMATICA
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NextPrim[n_] := Block[{k = n + 1}, While[ !PrimeQ[k], k++ ]; k]; p = 1; Do[ If[Mod[p = NextPrim[p], n] == n - 2, Print[n]], {n, 1, 10^9}] (from Robert G. Wilson v Feb 18 2004)
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CROSSREFS
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Cf. A004648 and esp. A023143.
Cf. A052013, A048891, A092044, A092045, A092046, A092047, A092048, A092049, A092050, A092051, A092052.
Adjacent sequences: A045921 A045922 A045923 this_sequence A045925 A045926 A045927
Sequence in context: A005433 A139009 A049204 this_sequence A068910 A035358 A065633
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KEYWORD
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nonn
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AUTHOR
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Len Smiley (smiley(AT)math.uaa.alaska.edu)
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EXTENSIONS
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More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1999.
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