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A003276
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Numbers n such that the multiplicative group of residues prime to n, M_n, is isomorphic to M_{n+1}.
(Formerly M3000)
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1
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1, 3, 15, 104, 495, 975, 22935, 32864, 57584, 131144, 491535, 2539004, 3988424, 6235215, 7378371, 13258575, 17949434, 25637744, 26879684, 29357475, 32235735, 41246864, 48615735, 184611375, 229944855, 257278724, 290849624, 429461864, 550666515, 671054835, 706075095
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| K. Miller, Solutions of phi(n) = phi(n+1) for 1 <= n <= 500000. Unpublished, 1972. [ Cf. Math. Comp., Vol. 27, p. 447, 1973 ].
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
D. Shanks, Solved and Unsolved Problems in Number Theory, 2nd. ed., Chelsea, 1978, p. 225.
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CROSSREFS
| Subset of A001274.
Sequence in context: A079486 A001274 A139766 * A136092 A181131 A145624
Adjacent sequences: A003273 A003274 A003275 * A003277 A003278 A003279
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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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EXTENSIONS
| More terms from David W. Wilson (davidwwilson(AT)comcast.net).
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