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A003275
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Values of phi(n) = phi(n+1).
(Formerly M1874)
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2
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1, 2, 8, 48, 80, 96, 128, 240, 288, 480, 1008, 1200, 1296, 1440, 1728, 2592, 2592, 4800, 5600, 6480, 8640, 11040, 12480, 14976, 19008, 19200, 22464, 24320, 24576
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| R. K. Guy, Unsolved Problems Number Theory, Sect. B36.
L. Moser, Some equations involving Euler's totient function, Amer. Math. Monthly, 56 (1949), 22-23.
K. Miller, Solutions of phi(n) = phi(n+1) for 1 <= n <= 500000. Unpublished, 1972. [ Cf. Math. Comp., Vol. 27, p. 447-448, 1973 ].
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..2567
Eric Weisstein's World of Mathematics, Totient Function
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MATHEMATICA
| Cases[Split[Table[EulerPhi[k], {k, 1, 50000}]], {_, _}][[1;; 27, 1]] (* Jean-François Alcover, Mar 20 2011 *)
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CROSSREFS
| Cf. A000010, A001274.
Sequence in context: A009566 A199136 A181413 * A078558 A003032 A193944
Adjacent sequences: A003272 A003273 A003274 * A003276 A003277 A003278
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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