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 A055954 #13 Aug 08 2024 07:29:30
%S A055954 0,2,4,6,8,10,12,8,16,24,32,40,48,56,16,24,32,40,48,56,64,24,32,40,48,
%T A055954 56,64,72,32,40,48,56,64,72,80,40,48,56,64,72,80,88,48,56,64,72,80,88,
%U A055954 96,50,100,150,200,250,300,350,64,114,164,214,264,314,364,78,128,178
%N A055954 a(n) = n + reversal of base 7 digits of n (written in base 10).
%C A055954 If n has an even number of digits in base 7 then a(n) is a multiple of 8
%H A055954 Seiichi Manyama, <a href="/A055954/b055954.txt">Table of n, a(n) for n = 0..10000</a>
%F A055954 a(n) = n + A030106(n).
%t A055954 Table[n+FromDigits[Reverse[IntegerDigits[n,7]],7],{n,0,70}] (* _Harvey P. Dale_, Jan 29 2020 *)
%o A055954 (PARI) a(n) = n + fromdigits(Vecrev(digits(n, 7)), 7); \\ _Michel Marcus_, Aug 08 2024
%Y A055954 Cf. A030106, A056964.
%K A055954 base,nonn
%O A055954 0,2
%A A055954 _Henry Bottomley_, Jul 18 2000