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Search: id:A060670
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| A060670 |
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phi(x) = n has exactly 7 solutions. |
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1
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| 32, 132, 156, 544, 912, 924, 1012, 1044, 1140, 1452, 1464, 1472, 1476, 1572, 1664, 1764, 2076, 2100, 2232, 2424, 2580, 2624, 2652, 3096, 3248, 3336, 3444, 3660, 3996, 4488, 4776, 4840, 5060, 5316, 5412, 5696, 6504, 6516, 6540, 6612, 6660, 6780, 6996
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OFFSET
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1,1
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EXAMPLE
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32 = phi(51) = phi(64) = phi(68) = phi(80) = phi(96) = phi(102) = phi(120).
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MATHEMATICA
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a = Table[ 0, {8000} ]; Do[ p = EulerPhi[ n ]; If[ p < 8001, a[ [ p ] ]++ ], {n, 1, 25000} ]; Select[ Range[ 8000 ], a[ [ # ] ] == 7 & ]
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CROSSREFS
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Cf. A007366, A007367.
Sequence in context: A031447 A035503 A059210 this_sequence A044364 A044745 A137740
Adjacent sequences: A060667 A060668 A060669 this_sequence A060671 A060672 A060673
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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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