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 A087710 Least k >= 6 such that A087666(k) = n. 3
 6, 10, 14, 7, 8, 31, 35, 17, 43, 40, 229, 248, 212, 818, 799, 733, 151, 2191, 1139, 20894, 877, 6835, 20528, 34627, 19687, 91790, 34502, 367558, 85336, 46375, 1342349, 134683, 109057, 2758327, 5921086, 1655564, 18147329, 11934733, 1315376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A087666: Consider the recurrence b(0) = n/3, b(n) = b(n-1)*floor(b(n-1)); sequence gives number of steps to reach an integer, or -1 if no integer is ever reached. - Robert G. Wilson v, Oct 10 2003 & Mar 10 2004 LINKS Chai Wah Wu, Table of n, a(n) for n = 0..60 MAPLE See the Maple program in A087666 for the best way to compute this sequence. - N. J. A. Sloane MATHEMATICA f[n_] := Block[{c = 1, k = n/3}, If[ IntegerQ[k], 0, While[tn = Floor[k]; tf = k - tn; tn = Mod[tn, 3^100]; k = tn(tn + tf); ! IntegerQ[k], c++ ]; c++ ]]; a = Table[0, {50}]; Do[ b = f[n]; If[ a[[b + 1]] == 0, a[[b + 1]] = n; Print[b, " = ", n]], {n, 6, 10^7}]; a (* Robert G. Wilson v, Mar 10 2004, using the idea from N. J. A. Sloane's Maple code in A087666) CROSSREFS Cf. A087666, A086336, A087663. Sequence in context: A189762 A163814 A088706 * A163504 A129146 A315158 Adjacent sequences: A087707 A087708 A087709 * A087711 A087712 A087713 KEYWORD nonn AUTHOR Benoit Cloitre, Sep 30 2003 EXTENSIONS More terms from Robert G. Wilson v, Oct 10 2003, Mar 10 2004 STATUS approved

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Last modified August 6 04:48 EDT 2024. Contains 374957 sequences. (Running on oeis4.)