cp's OEIS Frontend

A063050 a(n) = number of 'Reverse and Add!' operations that have to be applied to the n-th term of A063049 in order to obtain a term in the trajectory of 196.

%I A063050 #8 Oct 21 2019 19:28:11
%S A063050 1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
%T A063050 1,1,1,1,1,1,2,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,1,2,1,1,1,1,1,1,
%U A063050 1,1,1,1,1,1,2,1,2,1,2,1,1,1,1,0,1,1,1,2,2,2,1,1,1,1,1,1,1,1,2,2,2,1,1,1,1
%N A063050 a(n) = number of 'Reverse and Add!' operations that have to be applied to the n-th term of A063049 in order to obtain a term in the trajectory of 196.
%H A063050 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>
%e A063050 394 is a term of A063049. One 'Reverse and Add!' operation applied to 394 leads to a term (887) in the trajectory of 196, so the corresponding term of the present sequence is 1.
%t A063050 limit = 10^3; x = NestList[ # + IntegerReverse[#] &, 196, limit];
%t A063050 y = Select[Range[197, 4942],
%t A063050    Intersection[NestList[ # + IntegerReverse[#] &, #, limit],
%t A063050       x] != {} &];
%t A063050 Table[
%t A063050  Length@NestWhileList[# + IntegerReverse[#] &,
%t A063050     y[[i]], ! MemberQ[x, #] &] - 1, {i, Length[y]}]
%t A063050 (* _Robert Price_, Oct 21 2019 *)
%Y A063050 A023108, A033865, A006960, A063049.
%K A063050 base,nonn
%O A063050 0,41
%A A063050 _Klaus Brockhaus_, Jul 07 2001