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%I M3000
%S 1,3,15,104,495,975,22935,32864,57584,131144,491535,2539004,3988424,
%T 6235215,7378371,13258575,17949434,25637744,26879684,29357475,
%U 32235735,41246864,48615735,184611375,229944855,257278724,290849624,429461864,550666515,671054835,706075095
%N Numbers n such that the multiplicative group of residues prime to n, M_n, is isomorphic to M_{n+1}.
%D K. Miller, Solutions of phi(n) = phi(n+1) for 1 <= n <= 500000. Unpublished, 1972. [ Cf. Math. Comp., Vol. 27, p. 447, 1973 ].
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%D D. Shanks, Solved and Unsolved Problems in Number Theory, 2nd. ed., Chelsea, 1978, p. 225.
%Y Subset of A001274.
%K nonn,nice
%O 1,2
%A _N. J. A. Sloane_.
%E More terms from _David W. Wilson_.
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