A136137 a(n+1)=sopfr(3a(n)+1), with sopfr=A001414. Finishes with 17 (fixed point).

1, 4, 13, 11, 19, 31, 49, 41, 35, 55, 85, 16, 14, 43, 20, 61, 29, 17

Offset

1,2

Comments

In the class of recurrence sequences a(n+1)=sopfr(C*a(n)+D), with C=3, D=1.

Links

Table of n, a(n) for n=1..18.

Formula

a(n+1)=A001414(3*a(n)+1)

Mathematica

See A136136
Most[FixedPointList[Total[Times@@@FactorInteger[3#+1]]&, 1]] (* Harvey P. Dale, Dec 19 2022 *)

Crossrefs

Sequence in context: A173800 A175174 A369412 * A287895 A050223 A301792

Adjacent sequences: A136134 A136135 A136136 * A136138 A136139 A136140

Keyword

fini,nonn

Author

Carlos Alves, Dec 16 2007

Status

approved