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 A066985 #7 Jul 17 2023 08:27:15 %S A066985 4,11,13,17,19,27,72,199,242,529,800,841,1151,1171,1181,1303,1352, %T A066985 1373,1469,1747,1777,1787,1922,1949,1979,1999,2321,3125,3362,3421, %U A066985 3887,3993,4069,4096,4232,5389,5766,6272,7442,7961,7969,8921,10021,10082,10469 %N A066985 Reflective numbers: k such that the decimal encoding of the prime factorization of k (A067599) is palindromic. %e A066985 The decimal encoding of the prime factorization 13^1 * 313^1 of 4069 is 1313131, which is palindromic. So 4069 is a term of the sequence. %t A066985 f[n_] := Flatten[IntegerDigits[FactorInteger[n]]]; Select[Range[2, 11000], f[ # ] == Reverse[f[ # ]] &] %Y A066985 Cf. A067599, A067598. %K A066985 base,nonn %O A066985 1,1 %A A066985 _Joseph L. Pe_, Feb 01 2002 %E A066985 Edited by _Robert G. Wilson v_, Feb 08 2002 %E A066985 Offset corrected by _Mohammed Yaseen_, Jul 17 2023