id:A053285 - OEIS Search Results

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Totient of 2^n+1.

+0
1

2, 4, 6, 16, 20, 48, 84, 256, 324, 800, 1364, 3840, 5460, 12544, 19800, 65536, 87380, 186624, 349524, 986880, 1365336, 3345408, 5592404, 16515072, 20250000, 52306176, 84768120, 252645120, 351847488, 760320000, 1431655764, 4288266240 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)= A000010[A000051(n)]`
	EXAMPLE	`It is a power of 2 iff n is a Fermat prime`
	CROSSREFS	`Cf. A000010, A000225, A051953, A000051.` `Sequence in context: A000068 A067662 A001774 this_sequence A078148 A076075 A030157` `Adjacent sequences: A053282 A053283 A053284 this_sequence A053286 A053287 A053288`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Mar 03 2000`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research