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n+sigma(n)+sigma(sigma(n)) is a palindrome.
0

%I #2 Mar 30 2012 17:40:36

%S 1,2,15,24,25,29,43,46,57,65,95,119,121,157,173,531,1791,2072,2080,

%T 2169,2200,2205,2267,2411,2413,2444,2483,2553,2590,2623,2632,3329,

%U 3397,3442,3454,3529,3532,3583,3794,4131,4229,4314,4460,4596,4603

%N n+sigma(n)+sigma(sigma(n)) is a palindrome.

%e 2267 + sigma(2267) + sigma(sigma(2267)) = 11311.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, Feb 13 2006