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A060674
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phi(x) = n has exactly 11 solutions.
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0
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48, 512, 540, 1000, 1836, 2136, 2176, 2320, 2340, 3216, 3648, 3936, 4284, 4352, 4356, 4784, 5088, 5640, 5936, 6216, 6576, 6816, 7120, 7224, 7280, 7752, 8100, 8184, 8496, 8520, 8760, 9040, 9296, 9660, 9680, 9900, 9996, 10332, 10860, 11640, 11680
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 48 = phi(65) = phi(104) = phi(105) = phi(112) = phi(130) = phi(140) = phi(144) = phi(156) = phi(168) = phi(180) = phi(210).
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MATHEMATICA
| a = Table[ 0, {12500} ]; Do[ p = EulerPhi[ n ]; If[ p < 12501, a[ [ p ] ]++ ], {n, 1, 50000} ]; Select[ Range[ 12500 ], a[ [ # ] ] == 11 & ]
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CROSSREFS
| Cf. A007366, A007367.
Sequence in context: A168351 A198398 A034778 * A189346 A192832 A042949
Adjacent sequences: A060671 A060672 A060673 * A060675 A060676 A060677
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2001
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