1,2

a(n) + A004086(a(n)) = A010785(k) for an appropriate k.

Harvey P. Dale, Table of n, a(n) for n = 1..2000

Eric Weisstein's World of Mathematics, Repdigit

209 + A004086(209) = 209 + 902 = 1111 = A010785(28),

therefore 209 is a term: a(54)=209.

Select[Range[500], Count[DigitCount[# + IntegerReverse[#]], 0]==9&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 20 2020 *)

Sequence in context: A329230 A119798 A015976 * A174139 A037325 A293292

Adjacent sequences: A098889 A098890 A098891 * A098893 A098894 A098895

nonn,base

Reinhard Zumkeller, Nov 04 2004

approved