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A002312
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Arc-cotangent reducible numbers or non-Stormer numbers.
(Formerly M2613 N1033)
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6
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3, 7, 8, 13, 17, 18, 21, 30, 31, 32, 38, 41, 43, 46, 47, 50, 55, 57, 68, 70, 72, 73, 75, 76, 83, 91, 93, 98, 99, 100, 105, 111, 112, 117, 119, 122, 123, 128, 129, 132, 133, 142, 144, 155, 157, 162, 172, 173, 174, 177, 182, 183, 185, 187, 189, 191, 192, 193, 200
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| E. Kowalski, On the "reducibility" of arctangents of integers, Amer. Math. Monthly, Vol. 111, No. 4 (Apr. 2004), 351-354.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Todd, A problem on arc tangent relations, Amer. Math. Monthly, 56 (1949), 517-528.
J. Todd, Table of Arctangents. National Bureau of Standards, Washington, DC, 1951, p. 94.
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..1000
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MATHEMATICA
| lst={}; Do[n=m^2+1; p=FactorInteger[n][[ -1, 1]]; If[p<2m, AppendTo[lst, m]], {m, 200}]; lst (T. D. Noe (noe(AT)sspectra.com), Apr 09 2004)
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CROSSREFS
| Cf. A005528.
Sequence in context: A132017 A010342 A108873 * A106474 A127441 A067064
Adjacent sequences: A002309 A002310 A002311 * A002313 A002314 A002315
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Description and initial term modified Jan 15 1996.
More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jun 14 2002
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