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

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

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

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

Mathematica

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

Crossrefs

Cf. A115890, A115896, A115897.

Sequence in context: A274331 A177064 A092233 * A116017 A182060 A067033

Adjacent sequences: A115892 A115893 A115894 * A115896 A115897 A115898

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved