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Search: id:A075485
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| A075485 |
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Length of iteration list when Collatz-function is iterated with initial value -1+2^n. |
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+0
2
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| 1, 8, 17, 18, 107, 108, 47, 48, 62, 63, 157, 158, 159, 160, 130, 131, 225, 226, 178, 179, 304, 305, 474, 475, 445, 446, 385, 386, 449, 450, 451, 452, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 853, 854
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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n=4,-1+2^n=15,list={15,46,23,70,35,106,53,160,80,40,20, 10,5,16,8,4,2,1}, so a(4)=18
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FORMULA
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a(n)=A008908(2^n-1)
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CROSSREFS
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Cf. A006370, A008908, A074472, A075484-A075488.
Sequence in context: A024107 A066554 A046459 this_sequence A023700 A026231 A088488
Adjacent sequences: A075482 A075483 A075484 this_sequence A075486 A075487 A075488
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 26 2002
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