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Search: id:A003275
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| A003275 |
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Values of phi(n) = phi(n+1).
(Formerly M1874)
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+0
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; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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 Unpublished, 1972.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 ].
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..2567
Eric Weisstein's World of Mathematics, Totient Function
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CROSSREFS
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Cf. A000010, A001274.
Sequence in context: A135904 A145846 A009566 this_sequence A078558 A003032 A058928
Adjacent sequences: A003272 A003273 A003274 this_sequence A003276 A003277 A003278
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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