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A111089
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Largest prime factor of 2n.
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1
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2, 2, 3, 2, 5, 3, 7, 2, 3, 5, 11, 3, 13, 7, 5, 2, 17, 3, 19, 5, 7, 11, 23, 3, 5, 13, 3, 7, 29, 5, 31, 2, 11, 17, 7, 3, 37, 19, 13, 5, 41, 7, 43, 11, 5, 23, 47, 3, 7, 5, 17, 13, 53, 3, 11, 7, 19, 29, 59, 5, 61, 31, 7, 2, 13, 11, 67, 17, 23, 7, 71, 3, 73, 37, 5, 19, 11, 13, 79, 5, 3, 41, 83, 7
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| For composite indices we have a(n*m) = max(a(n), a(m)). - Stefan Steinerberger (hansibal(AT)hotmail.com), Nov 13 2005
Same as A006530 except for initial term. - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 17 2008
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MATHEMATICA
| Table[FactorInteger[2n][[ -1, 1]], {n, 100}] (*Chandler*)
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CROSSREFS
| Bisection of A006530.
Sequence in context: A078773 A151663 A162753 * A051664 A029656 A121306
Adjacent sequences: A111086 A111087 A111088 * A111090 A111091 A111092
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Nov 12 2005
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EXTENSIONS
| Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) and Stefan Steinerberger (hansibal(AT)hotmail.com), Nov 12 2005
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