A067036 Records for the number of integers k such that an integer is of the form k + reverse(k).
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 21, 24, 27, 30, 32, 36, 40, 45, 50, 54, 60, 63, 70, 72, 80, 81, 90, 100, 108, 120, 126, 140, 144, 160, 162, 180, 200, 210, 216, 240, 243, 270, 300, 320, 324, 360, 400, 405, 450, 500, 540, 600, 630, 700, 720, 800, 810
Offset: 1
Examples
3 is a record since there is an integer n (viz. 33, cf. A067032) such that for three integers k we have n = k + reverse(k) and for m < n there are at most two integers j such that m = j + reverse(j).
Links
- Giovanni Resta, Table of n, a(n) for n = 1..125
- N. J. A. Sloane, Transforms
- Index entries for sequences related to Reverse and Add!
Extensions
Offset set to 1 by Giovanni Resta, Jan 16 2020
Comments