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Search: id:A060669
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| A060669 |
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phi(x) = n has exactly 6 solutions. |
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+0
1
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| 12, 16, 84, 88, 112, 232, 348, 408, 592, 736, 760, 780, 832, 952, 984, 1032, 1048, 1068, 1128, 1232, 1272, 1312, 1332, 1428, 1432, 1488, 1552, 1608, 1692, 1912, 2052, 2200, 2272, 2292, 2436, 2484, 2552, 2576, 2608, 2632, 2700, 2728, 2832, 2848, 3048
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OFFSET
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1,1
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EXAMPLE
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12 = phi(13) = phi(21) = phi(26) = phi(28) = phi(36) = phi(42).
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MATHEMATICA
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a = Table[ 0, {4000} ]; Do[ p = EulerPhi[ n ]; If[ p < 4001, a[ [ p ] ]++ ], {n, 1, 15000} ]; Select[ Range[ 4000 ], a[ [ # ] ] == 6 & ]
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CROSSREFS
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Cf. A007366, A007367.
Sequence in context: A058203 A050585 A050555 this_sequence A087657 A059390 A064825
Adjacent sequences: A060666 A060667 A060668 this_sequence A060670 A060671 A060672
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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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