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A318534 Lexicographically first sequence of distinct positive integers such that [a(n) + a(n+1)] or [a(n) - a(n+1)] is a palindrome in base 10. 1
1, 2, 3, 4, 5, 6, 16, 7, 15, 18, 9, 13, 20, 12, 10, 23, 21, 34, 26, 29, 37, 40, 32, 24, 31, 35, 27, 17, 38, 28, 49, 39, 60, 41, 8, 14, 19, 25, 30, 36, 52, 47, 54, 43, 45, 56, 55, 11, 22, 44, 33, 66, 65, 46, 42, 57, 64, 67, 74, 77, 84, 87, 94, 97, 105, 76, 75, 86, 85, 96, 95, 107, 115, 117, 125, 127, 135, 137, 145, 147, 48 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Is this sequence a permutation of the positive integers?

LINKS

Jean-Marc Falcoz, Table of n, a(n) for n = 1..10001

EXAMPLE

The sequence starts with 1,2,3,4,5,6,16,7,15,18,9,... and we see that [1 + 2] is a palindrome (3); [2 + 3] is a palindrome (5); [3 + 4] is a palindrome (7); [4 + 5] is a palindrome (9); [5 + 6] is a palindrome (11); [6 + 16] is a palindrome (22); [16 - 7] is a palindrome (9); [7 + 15] is a palindrome (22); etc.

CROSSREFS

Cf A228730 (Lexicographically earliest sequence of distinct nonnegative integers such that the sum of two consecutive terms is a palindrome in base 10).

Sequence in context: A065637 A039061 A138987 * A265405 A171610 A004835

Adjacent sequences:  A318531 A318532 A318533 * A318535 A318536 A318537

KEYWORD

base,look,nonn

AUTHOR

Jean-Marc Falcoz and Eric Angelini, Aug 28 2018

STATUS

approved

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Last modified June 24 17:50 EDT 2019. Contains 324330 sequences. (Running on oeis4.)