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 A004176 #24 Oct 24 2023 20:38:21
%S A004176 0,0,2,3,4,5,6,7,8,9,0,0,2,3,4,5,6,7,8,9,20,2,22,23,24,25,26,27,28,29,
%T A004176 30,3,32,33,34,35,36,37,38,39,40,4,42,43,44,45,46,47,48,49,50,5,52,53,
%U A004176 54,55,56,57,58,59,60,6,62,63,64,65,66,67,68,69,70,7,72,73,74
%N A004176 Omit 1's from n.
%C A004176 a(210) = 20 is the first term that differs from the variant "strip any leading or trailing digits 1 from n" [where digits 1 "protected" on both sides by digits different from 1 would be preserved]. Up to there, if a(n) is palindromic, then n is not in A359510, but if a(n) is non-palindromic and n is prime, then n is in A359510. - _M. F. Hasler_, Jan 23 2023
%H A004176 Rémy Sigrist, <a href="/A004176/b004176.txt">Table of n, a(n) for n = 0..10000</a>
%t A004176 Table[FromDigits[DeleteCases[IntegerDigits[n],1]],{n,0,3000}] (* _Zak Seidov_, Dec 08 2010 *)
%o A004176 (PARI) a(n) = fromdigits(select(d -> d!=1, digits(n))) \\ _Rémy Sigrist_, Jul 13 2019
%o A004176 (Python) def A004176(n): return int(s) if (s:=str(n).replace('1','')) else 0 # _M. F. Hasler_, Jan 23 2023
%Y A004176 See A004720 for another version.
%Y A004176 Cf. A359510 (numbers that can't be written as a palindromic product).
%K A004176 nonn,base,look
%O A004176 0,3
%A A004176 _N. J. A. Sloane_