id:A033846 - OEIS Search Results

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Numbers n whose prime factors are 2 and 5.

+0
2

10, 20, 40, 50, 80, 100, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1280, 1600, 2000, 2500, 2560, 3200, 4000, 5000, 5120, 6250, 6400, 8000, 10000, 10240, 12500, 12800, 16000, 20000, 20480, 25000, 25600, 31250, 32000, 40000, 40960 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`n such that sum(d prime divisor of n, 1/d)=7/10 - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 13 2002` `n such that phi(n)=(2/5)*n - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 19 2002`
	CROSSREFS	`Sequence in context: A048011 A047881 A020953 this_sequence A114931 A013978 A053162` `Adjacent sequences: A033843 A033844 A033845 this_sequence A033847 A033848 A033849`
	KEYWORD	`nonn`
	AUTHOR	`Jeff Burch (gburch(AT)erols.com)`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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