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%I #11 Jul 29 2017 01:28:47
%S 1,3,6,11
%N Smallest palindrome k such that k - n is a distinct power of 2, i.e., a power of 2 that has not arisen earlier.
%C The terms a(4), a(5), a(7) and a(8), if they exist, are > 2*1000000. [_Lars Blomberg_, Nov 17 2011]
%e a(6) = 22 as 22 - 6 = 16 = 2^4, a power of 2 which has not arisen earlier.
%K base,more,nonn
%O 0,2
%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 01 2003