id:A058988 - OEIS Search Results

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For a rational number p/q let f(p/q) = p*q divided by number of divisors of p+q; a(n) is obtained by iterating f, starting at n/1, until an integer is reached, or if no integer is ever reached then a(n) = 0.

+0
4

1, 1, 1, 2, 30, 3, 14, 12, 18, 5, 33, 6, 26, 21, 3, 8, 51, 9, 38, 5, 28, 11, 92, 8, 50, 0, 9, 14, 116, 15, 93, 8, 66, 17, 105, 18, 74, 0, 156, 20, 492, 21, 86, 22, 60, 23, 0, 16, 147, 0, 17, 26, 212, 27, 330, 14, 114, 29, 354, 30, 61, 186, 9, 16, 260, 33, 201, 17, 138, 35, 426 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Cf. A058972, A058971, A058977.` `Sequence in context: A112784 A114533 A087194 this_sequence A078690 A071056 A075716` `Adjacent sequences: A058985 A058986 A058987 this_sequence A058989 A058990 A058991`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 17 2001`
	EXTENSIONS	`More terms from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jul 20 2001`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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