A076887 - OEIS

%I #21 Dec 09 2019 07:27:00

%S 1,3,4,7,6,12,8,15,13,12,36,48,84,72,144,96,180,156,102,152,133,132,

%T 192,152,192,260,182,192,306,378,456,450,399,728,396,558,576,518,408,

%U 314,360,494,400,354,532,374,384,528,714,936,810,768,1064,684,930,960

%N Sum of divisors of nonzero palindromic numbers.

%H David A. Corneth, <a href="/A076887/b076887.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Harvey P. Dale)

%F a(n) = A000203(A002113(n+1)). - _Omar E. Pol_, Dec 08 2019

%e a(11) = 36 because 36 is the sum of divisors of 11th nonzero palindromic number (i.e. 22).

%t DivisorSigma[1,#]&/@Select[Range[500],PalindromeQ] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Mar 06 2018 *)

%Y Cf. A000203, A002113.

%K base,nonn,look

%O 1,2

%A _Shyam Sunder Gupta_, Nov 25 2002

%E Both title and example clarified by _Omar E. Pol_, Dec 08 2019