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 A308071 #19 May 19 2019 19:44:22 %S A308071 0,1,2,3,4,5,6,7,13663722656306465044,13664030703642511032, %T A308071 13707143454447524553,13710552565235121771,14336552505653142213, %U A308071 14340267205650777016,14340267205651006010,15013125376232575510,15013125401147630620,10142740706726414575022612720 %N A308071 Numbers k such that k is the substring identical to the most significant digits of its base-8 representation. %C A308071 Numbers k whose base-8 representation begins with the same digits as k itself. %H A308071 Scott R. Shannon, <a href="/A308071/b308071.txt">Table of n, a(n) for n = 1..500</a> %e A308071 13663722656306465044_10 = 1366372265630646504424_8, which also begins with '13663722656306465044'. %o A308071 (PARI) isok(n) = my(vb=digits(n, 8), vd=digits(n)); vd == vector(#vd, k, vb[k]); \\ _Michel Marcus_, May 17 2019 %Y A308071 This is a subsequence of A228051. %Y A308071 See A181929, A307254, A307255, A307256, A307257, A308070, A308072 for other bases. %K A308071 nonn,base %O A308071 1,3 %A A308071 _Scott R. Shannon_, May 11 2019