id:A039636 - OEIS Search Results

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Number of steps to fixed point of "n -> n/2 or (n-1)/2 until result is prime".

+0
3

1, 1, 1, 2, 1, 2, 1, 3, 3, 2, 1, 3, 1, 2, 2, 4, 1, 4, 1, 3, 3, 2, 1, 4, 4, 2, 2, 3, 1, 3, 1, 5, 5, 2, 2, 5, 1, 2, 2, 4, 1, 4, 1, 3, 3, 2, 1, 5, 5, 5, 5, 3, 1, 3, 3, 4, 4, 2, 1, 4, 1, 2, 2, 6, 6, 6, 1, 3, 3, 3, 1, 6, 1, 2, 2, 3, 3, 3, 1, 5, 5, 2, 1, 5, 5, 2, 2, 4, 1, 4, 4, 3, 3, 2, 2, 6, 1, 6, 6, 6, 1, 6 (list; graph; listen)

	OFFSET	`0,4`
	MATHEMATICA	`nerlist[ n_Integer ] := Length/@Drop[ FixedPointList[ If[ EvenQ[ # ]&&#>2, #/ 2, If[ PrimeQ[ # ]\|\|(#===1), #, (#-1)/2 ] ]&, n, 20 ], -1 ]`
	CROSSREFS	`Cf. A039634-A039645.` `Sequence in context: A029198 A029175 A056889 this_sequence A078899 A055172 A029334` `Adjacent sequences: A039633 A039634 A039635 this_sequence A039637 A039638 A039639`
	KEYWORD	`nonn`
	AUTHOR	`Wouter Meeussen (wouter.meeussen(AT)pandora.be)`

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.

AT&T Labs Research