Search: id:A003624
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%I A003624 M3324
%S A003624 4,8,9,16,21,25,27,32,35,36,39,49,50,55,57,63,64,65,75,77,81,85,93,98,
%T A003624 100,111,115,119,121,125,128,129,133,143,144,155,161,169,171,175,183,
%U A003624 185,187,189,201,203,205,209,215,217,219,221,225,235,237,242,243,245,247
%N A003624 Duffinian numbers: n composite and relatively prime to sigma (n).
%D A003624 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003624 "The Duffinian Numbers" by L. Richard Duffy, J. Rec. Math., 12 (1979), 
               112-115.
%D A003624 J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 64.
%H A003624 T. D. Noe, <a href="b003624.txt">Table of n, a(n) for n=1..1000</a>
%Y A003624 Cf. A014567
%Y A003624 Sequence in context: A134344 A119315 A010390 this_sequence A100657 A140104 
               A127398
%Y A003624 Adjacent sequences: A003621 A003622 A003623 this_sequence A003625 A003626 
               A003627
%K A003624 nonn
%O A003624 1,1
%A A003624 N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein

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