A030163 - OEIS

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A030163

2*uphi(x)=x, where the unitary phi function (A047994) is defined by if x=p1^r1*p2^r2*p3^r3*... then uphi(x)=(p1^r1-1)(p2^r2-1)(p3^r3-1)...

2, 12, 168, 240, 14880, 65280, 7608944640, 4294901760, 1125874137169920, 18446744069414584320 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	CROSSREFS	`Sequence in context: A180420 A012328 A120958 * A052728 A052729 A098431` `Adjacent sequences: A030160 A030161 A030162 * A030164 A030165 A030166`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`

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Last modified February 17 23:55 EST 2012. Contains 206085 sequences.