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 A131058 #16 Nov 04 2024 16:58:31 %S A131058 0,1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,22,23,24,25,26,27,28, %T A131058 29,33,34,35,36,37,38,39,44,45,46,47,48,49,55,56,57,58,59,66,67,68,69, %U A131058 77,78,79,88,89,99,101,102,103,104,105,106,107,108,109,111,112,113,114,115 %N A131058 List of numbers n whose reverse, R(n), is not less than n. %C A131058 First terms not in A009993 are 11, 22, 33, etc. %H A131058 David A. Corneth, <a href="/A131058/b131058.txt">Table of n, a(n) for n = 1..10000</a> %t A131058 Select[Range[0, 200], FromDigits[Reverse[IntegerDigits[ # ]]]>=#&] %t A131058 Select[Range[0,200],IntegerReverse[#]>=#&] %o A131058 (PARI) is(n) = my(d=digits(n));sum(i=1,#d,10^(#d-i)*d[i]) <= sum(i=1,#d,10^(i-1)*d[i]) \\ _David A. Corneth_, Apr 25 2016 %o A131058 (PARI) isok(n) = subst(Polrev(digits(n)), x, 10) >= n; \\ _Michel Marcus_, Apr 25 2016 %Y A131058 Cf. A002113, A009993. %K A131058 nonn,base %O A131058 1,3 %A A131058 _Zak Seidov_, Sep 24 2007