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).
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, 26, 37, 46, 9, 20, 31, 42, 53, 64, 73, 40, 51, 62, 93, 60, 14, 25, 36, 56, 12, 23, 34, 45, 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
Offset: 1
Examples
a(6) = 6 and a(7) = 10; the addition 6 + (0)1 is a palindrome (7). a(7) = 10 and a(8) = 19; the addition 10 + 91 is a palindrome (101). a(8) = 19 and a(9) = 28; the addition 19 + 82 is a palindrome (101). Etc.
Links
- Carole Dubois, Table of n, a(n) for n = 1..5001
Crossrefs
Cf. A337865 (no term ending in zero is permitted).
Comments