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 A284632 #20 Sep 08 2022 08:46:19
%S A284632 2,6,22,26,62,66,222,226,262,266,622,626,662,666,2222,2226,2262,2266,
%T A284632 2622,2626,2662,2666,6222,6226,6262,6266,6622,6626,6662,6666,22222,
%U A284632 22226,22262,22266,22622,22626,22662,22666,26222,26226,26262,26266,26622,26626
%N A284632 Numbers n with digits 2 and 6 only.
%C A284632 All terms after 2 are composite.
%F A284632 a(n) = 2 * A032917(n).
%t A284632 Table[Map[FromDigits, Tuples[{2, 6}, {k}]], {k, 5}] // Flatten (* _Michael De Vlieger_, Mar 30 2017 *)
%o A284632 (Magma) [n: n in [1..100000] | Set(IntegerToSequence(n, 10)) subset {2, 6}]
%Y A284632 Cf. A032917.
%Y A284632 Numbers n with digits 6 and k only for k = 0..5 and 7..9: A204093 (k = 0), A284293 (k = 1), this sequence (k = 2), A284633 (k = 3), A284634 (k = 4), A256291 (k = 5), A256292 (k = 7), A284635 (k = 8), A284636 (k = 9).
%K A284632 nonn,base
%O A284632 1,1
%A A284632 _Jaroslav Krizek_, Mar 30 2017