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Search: id:A114599
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| 1, 1, 2, 3, 7, 22, 78, 144, 40, 16, 11, 23, 254, 2922, 61850, 602420, 409448, 42038, 2669414, 38065410, 255320214, 315752716934, 22408767609924, 18684193273697426172, 85136306795697966858, 4400725717987783759574480
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OFFSET
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1,3
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EXAMPLE
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13 is the greatest prime dividing a(7) = 78, and 3 is the greatest prime dividing a(8) = 144. So a(9) = 1 +
13*3 = 40.
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MATHEMATICA
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f[n_] := If[n == 1, 1, FactorInteger[n][[ -1, 1 ]]]; g[l_] := Append[l, 1 + Times @@ f /@ Take[l, -2]]; Nest[g, {1, 1}, 30] (*Chandler*)
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CROSSREFS
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Cf. A006530, A114600.
Sequence in context: A067738 A053966 A010738 this_sequence A094062 A038159 A077210
Adjacent sequences: A114596 A114597 A114598 this_sequence A114600 A114601 A114602
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 13 2005
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 26 2005
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