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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.

A247123 Palindromes obtained after one iteration of Reverse and Add applied to the terms of A015976.

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%I A247123 #21 Nov 28 2014 23:51:42
%S A247123 2,4,6,8,11,22,33,44,55,66,77,88,99,22,33,44,55,66,77,88,99,121,33,44,
%T A247123 55,66,77,88,99,121,44,55,66,77,88,99,121,55,66,77,88,99,121,66,77,88,
%U A247123 99,121,77
%N A247123 Palindromes obtained after one iteration of Reverse and Add applied to the terms of A015976.
%t A247123 Select[(FromDigits[#] + FromDigits[Reverse[#]]) & /@ IntegerDigits[Range[1000]], IntegerDigits[#] == Reverse[IntegerDigits[#]] &]
%Y A247123 Cf. A015976 (One iteration of Reverse and Add is needed to reach a palindrome).
%K A247123 nonn,base
%O A247123 2,1
%A A247123 _Morgan L. Owens_, Nov 21 2014

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