Search: id:A003275
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%I A003275 M1874
%S A003275 1,2,8,48,80,96,128,240,288,480,1008,1200,1296,1440,1728,2592,2592,
%T A003275 4800,5600,6480,8640,11040,12480,14976,19008,19200,22464,24320,24576
%N A003275 Values of phi(n) = phi(n+1).
%D A003275 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003275 R. K. Guy, Unsolved Problems Number Theory, Sect. B36.
%D A003275 L. Moser, Some equations involving Euler's totient function, Amer. Math. 
               Monthly, 56 (1949), 22-23.
%D A003275 K. Miller, Solutions of phi(n) = phi(n+1) for 1 <= n <= 500000. Unpublished, 
               1972. [ Cf. Math. Comp., Vol. 27, p. 447-448, 1973 ].
%H A003275 T. D. Noe, <a href="b003275.txt">Table of n, a(n) for n=1..2567</a>
%H A003275 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TotientFunction.html">Totient Function</a>
%Y A003275 Cf. A000010, A001274.
%Y A003275 Sequence in context: A135904 A145846 A009566 this_sequence A078558 A003032 
               A058928
%Y A003275 Adjacent sequences: A003272 A003273 A003274 this_sequence A003276 A003277 
               A003278
%K A003275 nonn,nice
%O A003275 1,2
%A A003275 N. J. A. Sloane (njas(AT)research.att.com).

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