id:A039635 - OEIS Search Results

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Fixed point of "n -> n/2 or (n+1)/2 until result is prime".

+0
4

1, 2, 3, 2, 5, 3, 7, 2, 5, 5, 11, 3, 13, 7, 2, 2, 17, 5, 19, 5, 11, 11, 23, 3, 13, 13, 7, 7, 29, 2, 31, 2, 17, 17, 5, 5, 37, 19, 5, 5, 41, 11, 43, 11, 23, 23, 47, 3, 13, 13, 13, 13, 53, 7, 7, 7, 29, 29, 59, 2, 61, 31, 2, 2, 17, 17, 67, 17, 5, 5, 71, 5, 73, 37, 19, 19, 5, 5, 79, 5, 41 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`upp[ n_Integer ] := FixedPoint[ If[ EvenQ[ # ]&&#>2, #/2, If[ PrimeQ[ # ]\|\|(#=== 1), #, (#+1)/2 ] ]&, n, 20 ]`
	CROSSREFS	`Cf. A039634-A039645.` `Sequence in context: A102095 A109395 A072593 this_sequence A081812 A139421 A072505` `Adjacent sequences: A039632 A039633 A039634 this_sequence A039636 A039637 A039638`
	KEYWORD	`nonn`
	AUTHOR	`Wouter Meeussen (wouter.meeussen(AT)pandora.be)`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research