id:A137602 - OEIS Search Results

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a(n) is the smallest number m such that sigma(m)=n*pi(m), or 0 if no such m exists.

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3, 2, 6, 38, 44, 92, 66, 174, 108, 688, 120, 954, 300, 2744, 3186, 2424, 2070, 2904, 1080, 3432, 17004, 1042810, 8976, 32232, 20916, 19260, 76908, 5284804, 98064, 281600, 31320, 4070868, 3013472, 69720, 1126380, 7272564, 52920, 316080, 336840 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`There is no number m such that sigma(m)=pi(m).`
	EXAMPLE	`a(29)=5284804 because sigma(5284804)=29*pi(5284804) and 5284804 is the smallest such number.`
	CROSSREFS	`Cf. A055234.` `Sequence in context: A110768 A140230 A025240 this_sequence A018864 A019951 A019971` `Adjacent sequences: A137599 A137600 A137601 this_sequence A137603 A137604 A137605`
	KEYWORD	`easy,nonn,less`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 11 2008`

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

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