A087261 a(n) = lcm(4n, A025586(4n)), least common multiple of 4n and the largest value in 3x+1 iteration list started at 4n.

4, 8, 48, 16, 20, 24, 364, 32, 468, 40, 572, 48, 52, 56, 480, 64, 68, 72, 1672, 80, 84, 88, 3680, 96, 100, 104, 249264, 112, 116, 480, 286192, 128, 132, 136, 1120, 144, 148, 152, 11856, 160, 378512, 168, 8428, 176, 180, 184, 433904, 192, 196, 200, 11832, 208, 212

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Index entries for sequences related to 3x+1 (or Collatz) problem

Mathematica

c[x_] := (1-Mod[x, 2])*(x/2)+Mod[x, 2]*(3*x+1)c[1]=1; fpl[x_] := Delete[FixedPointList[c, x], -1] Table[LCM[4*w, Max[fpl[4*w]]], {w, 1, 256}]

Crossrefs

Cf. A025586, A033496, A087260.

Sequence in context: A183394 A291948 A002470 * A249572 A078236 A054881

Adjacent sequences: A087258 A087259 A087260 * A087262 A087263 A087264

Keyword

nonn

Author

Labos Elemer, Sep 09 2003

Status

approved