A136137 - OEIS

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

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OFFSET

1,2

COMMENTS

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

LINKS

FORMULA

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

MATHEMATICA

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

CROSSREFS

KEYWORD

fini,nonn

AUTHOR

Carlos Alves, Dec 16 2007

STATUS

approved