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 A062943 #32 Jan 28 2020 02:18:43
%S A062943 0,1,2,3,4,5,6,426,428,452,880,906,932,1360,7687134,53809938,
%T A062943 2571412221,2582875882,5016909933,5154289245,7736157463,7748731389,
%U A062943 39728612701,109634280128,116779253264,198109784526,233617301990,480974817878,1011847148845,1432434922737
%N A062943 When expressed in base 7 and then interpreted in base 9, is a multiple of the original number.
%C A062943 The terms I added (including those in the b-file) are all the remaining ones < 10^30. They have been computed by essentially using ideas from _Giovanni Resta_. - _Dimiter Skordev_, Jan 26 2020
%H A062943 Dimiter Skordev, <a href="/A062943/b062943.txt">Table of n, a(n) for n = 1..103</a>
%H A062943 Dimiter Skordev, <a href="/A062943/a062943_1.py.txt">Python script</a>
%e A062943 426 in base 7 is 1146, which interpreted in base 9 is 852=2*426.
%t A062943 Join[{0},Select[Range[1400],Divisible[FromDigits[IntegerDigits[#,7],9],#]&]] (* _Harvey P. Dale_, Mar 29 2012 *)
%Y A062943 Cf. A032549.
%K A062943 base,nonn
%O A062943 1,3
%A A062943 _Erich Friedman_, Jul 21 2001
%E A062943 More terms from _Naohiro Nomoto_, Aug 07 2001
%E A062943 a(16) and beyond from _Dimiter Skordev_, Jan 25 2020