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

1,1

Links

Table of n, a(n) for n=1..45.

Example

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.

Mathematica

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

Crossrefs

Cf. A067599, A067598.

Sequence in context: A285633 A266281 A154040 * A228003 A347561 A234903

Adjacent sequences: A066982 A066983 A066984 * A066986 A066987 A066988

Keyword

base,nonn

Author

Joseph L. Pe, Feb 01 2002

Extensions

Edited by Robert G. Wilson v, Feb 08 2002

Offset corrected by Mohammed Yaseen, Jul 17 2023

Status

approved