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A115895
Numbers k such that k + sigma(k) is a palindrome.
5
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
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
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved