%I #14 Sep 25 2024 09:33:39
%S 3,7,11,15,55,59,99,103,305,507,709,911,123,325,527,729,931,143,345,
%T 547,749,951,163,365,567,769,971,183,385,587,789,991,203,306,607,710,
%U 21,16,65,60,10,5,9,13,35,57,79,101,105,505,509,909,913,323,327,727,731,141,145
%N Start with 3 and repeatedly reverse the digits and add 4 to get the next term.
%H N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.
%H <a href="/index/Rec#order_54">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
%F Has period 54: see A117827, A117830.
%p read transforms; t1:=[3]; for n from 1 to 80 do t1:=[op(t1),4+digrev(t1[n])]; od: # _N. J. A. Sloane_
%t f[n_] := 4 + FromDigits@ Reverse@ IntegerDigits@n; NestList[ f@# &, 3, 58] (* _James C. McMahon_, Sep 24 2024 *)
%Y Cf. A117827, A117828, A117830.
%K nonn,base
%O 1,1
%A Luc Stevens (lms022(AT)yahoo.com), Apr 06 2006