A095387 Initial values for 3x+1 trajectories of which the largest term is 9232.

27, 31, 41, 47, 54, 55, 62, 63, 71, 73, 82, 83, 91, 94, 95, 97, 103, 107, 108, 109, 110, 111, 121, 124, 125, 126, 129, 137, 142, 143, 145, 146, 147, 155, 159, 161, 164, 165, 166, 167, 171, 175, 182, 183, 188, 189, 190, 193, 194, 195, 199, 206, 207, 214, 215

Offset: 1

Author

Labos Elemer, Jun 14 2004

Keywords

• nonn
• fini
• full

Comments

Altogether 1579 such initial values exist: 27, ..., 9232.

Links

• Jinyuan Wang, Table of n, a(n) for n = 1..1579
• Index entries for sequences related to 3x+1 (or Collatz) problem

Crossrefs

Cf. A025586.

Programs

Mathematica

c[x_]:=c[x]=(1-Mod[x, 2])*(x/2)+Mod[x, 2]*(3*x+1);c[1]=1; fpl[x_]:=Delete[FixedPointList[c, x], -1] {ta=Table[0, {1580}], u=1}; Do[If[Equal[Max[fpl[n]], 9232], ta[[u]]=n;u=u+1], {n, 1, 9232}];ta

Formula

1579 solutions to A025586(x) = 9232.