%I A003276 M3000
%S A003276 1,3,15,104,495,975,22935,32864,57584,131144,491535,2539004,3988424,6235215,
%T A003276 7378371,13258575,17949434,25637744,26879684,29357475,32235735,41246864,
               48615735,
%U A003276 184611375,229944855,257278724,290849624,429461864,550666515,671054835,
               706075095
%N A003276 Numbers n such that the multiplicative group of residues prime to n, 
               M_n, is isomorphic to M_{n+1}.
%D A003276 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003276 K. Miller, Solutions of phi(n) = phi(n+1) for 1 <= n <= 500000. Unpublished, 
               1972. [ Cf. Math. Comp., Vol. 27, p. 447, 1973 ].
%D A003276 D. Shanks, Solved and Unsolved Problems in Number Theory, 2nd. ed., Chelsea, 
               1978, p. 225.
%Y A003276 Subset of A001274.
%Y A003276 Sequence in context: A079486 A001274 A139766 this_sequence A136092 A145624 
               A025547
%Y A003276 Adjacent sequences: A003273 A003274 A003275 this_sequence A003277 A003278 
               A003279
%K A003276 nonn,nice
%O A003276 1,2
%A A003276 N. J. A. Sloane (njas(AT)research.att.com).
%E A003276 More terms from David W. Wilson (davidwwilson(AT)comcast.net).