A066985 Reflective numbers: k such that the decimal encoding of the prime factorization of k (A067599) is palindromic.

4, 11, 13, 17, 19, 27, 72, 199, 242, 529, 800, 841, 1151, 1171, 1181, 1303, 1352, 1373, 1469, 1747, 1777, 1787, 1922, 1949, 1979, 1999, 2321, 3125, 3362, 3421, 3887, 3993, 4069, 4096, 4232, 5389, 5766, 6272, 7442, 7961, 7969, 8921, 10021, 10082, 10469

Offset: 1

Author

Joseph L. Pe, Feb 01 2002

Keywords

• base
• nonn

Examples

			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.
		

Crossrefs

Cf. A067599, A067598.

Programs

Mathematica

f[n_] := Flatten[IntegerDigits[FactorInteger[n]]]; Select[Range[2, 11000], f[ # ] == Reverse[f[ # ]] &]

Extensions

Edited by Robert G. Wilson v, Feb 08 2002

Offset corrected by Mohammed Yaseen, Jul 17 2023