

A318486


Lexicographically first sequence of different positive terms such that a(n)  [the first digit of a(n+1)] is a palindrome.


2



1, 10, 2, 11, 3, 12, 4, 13, 5, 14, 6, 15, 7, 16, 8, 17, 9, 18, 70, 40, 71, 50, 60, 51, 72, 61, 62, 73, 74, 80, 30, 81, 41, 82, 52, 83, 63, 84, 75, 90, 20, 91, 31, 92, 42, 93, 53, 94, 64, 95, 78, 19, 85, 86, 96, 89, 100, 101, 23, 102, 34, 103, 24, 25, 35, 26, 45, 104, 36, 37, 46, 27, 56, 105, 47, 38, 57, 28, 67, 106, 58, 39
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


LINKS

JeanMarc Falcoz, Table of n, a(n) for n = 1..10001


EXAMPLE

The sequence starts with 1,10,2,11,3,12,4,13,5,14,6… and we see that [1  (the first digit of 10 = 1)] is a palindrome (0); [10  (the first digit of 2 = 2)] is a palindrome (8); [2  (the first digit of 11 = 1)] is a palindrome (1); [11  (the first digit of 3 = 3)] is a palindrome (8); etc.


CROSSREFS

Sequence in context: A111287 A255668 A187815 * A303850 A303848 A303783
Adjacent sequences: A318483 A318484 A318485 * A318487 A318488 A318489


KEYWORD

base,nonn,look


AUTHOR

Eric Angelini and JeanMarc Falcoz, Aug 27 2018


STATUS

approved



