id:A117296 - OEIS Search Results

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Numbers n for which phi(n) is a palindrome.

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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; listen)

	OFFSET	`1,2`
	EXAMPLE	`69 is in the sequence because phi(69)=44 which is a palindrome.`
	MATHEMATICA	`Select[Range[600], FromDigits[Reverse[IntegerDigits[EulerPhi[ # ]]]]==EulerPhi[ # ] &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 24 2006`
	CROSSREFS	`Cf. A002113.` `Sequence in context: A079333 A063938 A002473 this_sequence A096503 A055238 A100952` `Adjacent sequences: A117293 A117294 A117295 this_sequence A117297 A117298 A117299`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006`
	EXTENSIONS	`Corrected and extended by Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 24 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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