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A117296
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Numbers n for which phi(n) is a palindrome.
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0
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 23, 24, 30, 46, 67, 69, 89, 92, 115, 134, 138, 178, 184, 223, 230, 233, 263, 276, 283, 289, 293, 295, 301, 321, 381, 387, 411, 428, 441, 446, 466, 472, 508, 526, 535, 548, 566, 578, 586, 590
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 69 is in the sequence because phi(69)=44 which is a palindrome.
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MATHEMATICA
| Select[Range[600], FromDigits[Reverse[IntegerDigits[EulerPhi[ # ]]]]==EulerPhi[ # ] &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 24 2006
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CROSSREFS
| Cf. A002113.
Sequence in context: A178862 A178860 A178858 * A096503 A055238 A100952
Adjacent sequences: A117293 A117294 A117295 * A117297 A117298 A117299
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KEYWORD
| base,nonn
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AUTHOR
| Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006
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EXTENSIONS
| Corrected and extended by Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 24 2006
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