A337880 - OEIS

A337880

Lexicographically earliest sequence of distinct positive integers such that the sum of a(n) and [a(n+1) reversed] is a palindrome in base 10 (terms ending in zero permitted).

%I #20 Sep 30 2020 14:56:14

%S 1,2,3,4,5,6,10,19,28,17,48,7,18,38,16,27,47,8,30,41,52,63,83,50,15,

%T 26,37,46,9,20,31,42,53,64,73,40,51,62,93,60,14,25,36,56,12,23,34,45,

%U 65,21,32,43,54,74,72,61,102,90,11,22,33,44,55,66,57,13,24,35,67,49,29,84,71

%N Lexicographically earliest sequence of distinct positive integers such that the sum of a(n) and [a(n+1) reversed] is a palindrome in base 10 (terms ending in zero permitted).

%C Terms ending in zero are permitted; when they are reversed, the leading zero(s) is (are) erased.

%H Carole Dubois, <a href="/A337880/b337880.txt">Table of n, a(n) for n = 1..5001</a>

%e a(6) = 6 and a(7) = 10; the addition 6 + (0)1 is a palindrome (7).

%e a(7) = 10 and a(8) = 19; the addition 10 + 91 is a palindrome (101).

%e a(8) = 19 and a(9) = 28; the addition 19 + 82 is a palindrome (101). Etc.

%Y Cf. A337865 (no term ending in zero is permitted).

%K nonn,base,look

%O 1,2

%A _Eric Angelini_ and _Carole Dubois_, Sep 28 2020