A116031 - OEIS

%I #5 Mar 30 2012 17:40:36

%S 4,388,403,10010,11481,12215,41242,42173,44243,223261,223487,403303,

%T 2302031,3288877,3490447,32605627,40077553,40162802,42311323,44044043,

%U 117426509,222613051,230777581,232075811,287772226,307222207,327067459

%N sigma(n)-phi(n) and sigma(n)+phi(n) are two palindromes greater than 2.

%e sigma(3288877)-phi(3288877) = 44444 and

%e sigma(3288877)+phi(3288877)=6577756.

%Y Cf. A115897, A116030.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 13 2006

%E a(15)-a(27) from _Donovan Johnson_, Feb 05 2010