id:A039769 - OEIS Search Results

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phi(a(n)) and (a(n)-1) have a common factor but are distinct.

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9, 15, 21, 25, 27, 28, 33, 35, 39, 45, 49, 51, 52, 55, 57, 63, 65, 66, 69, 70, 75, 76, 77, 81, 85, 87, 91, 93, 95, 99, 105, 111, 112, 115, 117, 119, 121, 123, 124, 125, 129, 130, 133, 135, 141, 143, 145, 147, 148, 153, 154, 155, 159, 161, 165, 169, 171, 172, 175 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`phi(21)=12, gcd(12,20)=4.`
	CROSSREFS	`Cf. A000010.` `Sequence in context: A038599 A079364 A160666 this_sequence A071904 A014076 A067800` `Adjacent sequences: A039766 A039767 A039768 this_sequence A039770 A039771 A039772`
	KEYWORD	`nonn,easy`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research