This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A084991 #3 Nov 24 2017 16:23:34
%S A084991 4,5,6,7,8,9,22,33,44,55,66,88,99,111,141,151,181,202,212,222,232,242,
%T A084991 252,262,272,282,292,313,333,404,414,424,434,444,454,464,474,484,494,
%U A084991 505,525,565,595,606,616,626,636,646,656,666,676,686,696,808,818,828,838,848,858,868,878,888,898,909,939,949,969,979,999
%N A084991 Palindromes which can be written as a sum of two prime numbers.
%e A084991 E.g. 181 is a palindrome and is 179 + 2. 179 and 2 are both prime.
%t A084991 With[{upto=1000},Select[Select[Union[Total/@Tuples[Prime[ Range[ upto]],2]],# == IntegerReverse[#]&],#<=upto&]] (* _Harvey P. Dale_, Nov 24 2017 *)
%Y A084991 Cf. A014091.
%K A084991 nonn,base
%O A084991 1,1
%A A084991 Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 27 2003
%E A084991 More terms from _Harvey P. Dale_, Nov 24 2017