cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A115895 Numbers k such that k + sigma(k) is a palindrome.

Original entry on oeis.org

1, 2, 3, 4, 5, 9, 34, 64, 81, 128, 141, 148, 151, 161, 162, 170, 181, 191, 196, 198, 219, 236, 249, 256, 257, 260, 277, 282, 297, 315, 322, 326, 327, 334, 346, 353, 355, 358, 373, 375, 377, 383, 387, 415, 473, 479, 499, 714, 793, 1225, 1316, 1420, 1517, 1593
Offset: 1

Views

Author

Giovanni Resta, Feb 06 2006

Keywords

Examples

			128 + sigma(128) = 128 + 255 = 383.
		

Crossrefs

Programs

  • Mathematica
    Select[Range[1600],PalindromeQ[#+DivisorSigma[1,#]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 29 2017 *)