id:A030164 - OEIS Search Results

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uphi(sigma(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)...

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2, 8, 128, 720, 32768, 103680, 50181120, 2147483648 (list; graph; listen)

	OFFSET	`0,1`
	CROSSREFS	`Sequence in context: A064205 A081856 A038533 this_sequence A139290 A114977 A011822` `Adjacent sequences: A030161 A030162 A030163 this_sequence A030165 A030166 A030167`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`

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Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.