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Search: id:A060671
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| A060671 |
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phi(x) = n has exactly 8 solutions. |
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+0
2
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| 36, 64, 176, 200, 224, 280, 324, 464, 520, 888, 920, 1184, 1368, 1400, 1520, 1696, 1720, 1904, 1960, 2040, 2096, 2120, 2256, 2392, 2600, 2656, 2712, 2752, 2864, 2944, 2960, 2968, 2976, 2988, 3104, 3276, 3300, 3408, 3616, 3640, 3792, 3800, 3816, 3824
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OFFSET
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1,1
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EXAMPLE
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36 = phi(37) = phi(57) = phi(63) = phi(74) = phi(76) = phi(108) = phi(114) = phi(126).
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MATHEMATICA
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a = Table[ 0, {5000} ]; Do[ p = EulerPhi[ n ]; If[ p < 5001, a[ [ p ] ]++ ], {n, 1, 25000} ]; Select[ Range[ 5000 ], a[ [ # ] ] == 8 & ]
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CROSSREFS
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Cf. A007366, A007367.
Sequence in context: A043242 A044022 A082295 this_sequence A074315 A126789 A068144
Adjacent sequences: A060668 A060669 A060670 this_sequence A060672 A060673 A060674
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2001
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