%I A002312 M2613 N1033
%S A002312 3,7,8,13,17,18,21,30,31,32,38,41,43,46,47,50,55,57,68,70,72,73,75,76,
%T A002312 83,91,93,98,99,100,105,111,112,117,119,122,123,128,129,132,133,142,
%U A002312 144,155,157,162,172,173,174,177,182,183,185,187,189,191,192,193,200
%N A002312 Arc-cotangent reducible numbers or non-Stormer numbers.
%D A002312 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002312 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002312 E. Kowalski, On the "reducibility" of arctangents of integers, Amer. 
               Math. Monthly, Vol. 111, No. 4 (Apr. 2004), 351-354.
%D A002312 J. Todd, A problem on arc tangent relations, Amer. Math. Monthly, 56 
               (1949), 517-528.
%D A002312 J. Todd, Table of Arctangents. National Bureau of Standards, Washington, 
               DC, 1951, p. 94.
%H A002312 T. D. Noe, <a href="b002312.txt">Table of n, a(n) for n = 1..1000</a>
%t A002312 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)
%Y A002312 Cf. A005528.
%Y A002312 Sequence in context: A132017 A010342 A108873 this_sequence A106474 A127441 
               A067064
%Y A002312 Adjacent sequences: A002309 A002310 A002311 this_sequence A002313 A002314 
               A002315
%K A002312 nonn,nice
%O A002312 1,1
%A A002312 N. J. A. Sloane (njas(AT)research.att.com).
%E A002312 Description and initial term modified Jan 15 1996.
%E A002312 More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jun 14 2002