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Search: id:A060675
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| A060675 |
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phi(x) = n has exactly 12 solutions. |
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+0
1
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| 160, 168, 352, 448, 816, 928, 972, 1024, 1176, 1848, 2464, 3040, 3808, 4152, 4440, 4512, 4736, 4944, 5104, 5152, 5160, 5304, 5952, 6408, 6656, 6672, 6784, 7648, 8384, 8704, 8904, 10432, 10528, 10624, 11000, 11008, 11456, 11776, 12048, 12416, 13024
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OFFSET
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1,1
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EXAMPLE
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160 = phi(187) = phi(205) = phi(328) = phi(352) = phi(374) = phi(400) = phi(410) = phi(440) = phi(492) = phi(528) = phi(600) = phi(660).
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MATHEMATICA
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a = Table[ 0, {15000} ]; Do[ p = EulerPhi[ n ]; If[ p < 15001, a[ [ p ] ]++ ], {n, 1, 60000} ]; Select[ Range[ 15000 ], a[ [ # ] ] == 12 & ]
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CROSSREFS
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Cf. A007366, A007367.
Sequence in context: A013455 A013465 A013466 this_sequence A127338 A138854 A133530
Adjacent sequences: A060672 A060673 A060674 this_sequence A060676 A060677 A060678
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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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