id:A085817 - OEIS Search Results

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Start at (2n+1)/4 and iterate the map x -> x*ceiling(x); sequence gives values of n for which the denominators in the orbit drop directly from 4 to 1, bypassing 2.

+0
4

4, 6, 7, 9, 12, 13, 14, 15, 20, 21, 22, 23, 24, 30, 31, 36, 38, 39, 41, 44, 45, 46, 47, 52, 53, 54, 55, 56, 62, 63, 69, 70, 71, 73, 76, 77, 78, 79, 81, 86, 87, 88, 94, 95, 96, 97, 101, 102, 103, 105, 108, 109, 110, 111, 112, 118, 119, 120, 126, 127, 129, 132, 133, 134, 135, 137 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`No formula is known for these numbers.`
	LINKS	`J. C. Lagarias and N. J. A. Sloane, Approximate squaring (pdf, ps), Experimental Math., 13 (2004), 113-128.`
	CROSSREFS	`Complement of A085833.` `A073341 gives number of steps until reach an integer. Cf. A085785.` `Sequence in context: A069909 A101993 A002481 this_sequence A047508 A089960 A067888` `Adjacent sequences: A085814 A085815 A085816 this_sequence A085818 A085819 A085820`
	KEYWORD	`nonn`
	AUTHOR	`njas, Aug 16 2003`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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