A098010 Record lengths of transient part of aliquot sequences corresponding to entries in A098009.

1, 2, 3, 4, 7, 15, 18, 178

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Example

138 has a transient of length 177 (see Guy's book).

Mathematica

g[n_] := If[n > 0, DivisorSigma[1, n] - n, 0]; f[n_] := NestWhileList[g, n, UnsameQ, All]; a = -1; Do[b = Length[ f[n]] - 2; If[b > a, a = b; Print[b]], {n, 275}] (* Robert G. Wilson v, Sep 10 2004 *)

Crossrefs

See A098009 for discussion, see A098008 for references.

Sequence in context: A290992 A361229 A265742 * A088533 A091155 A359193

Adjacent sequences: A098007 A098008 A098009 * A098011 A098012 A098013

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 10 2004

Extensions

18 and 178 from Robert G. Wilson v, Sep 10 2004

Status

approved