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Search: id:A066985
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| A066985 |
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Reflective numbers: n such that the decimal encoding of the prime factorization of n (A067599) is palindronomic. |
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+0
1
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| 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
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OFFSET
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2,1
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EXAMPLE
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The decimal encoding of the prime factorization 13^1 * 313^1 of 4069 is 1313131, which is palindronomic. So 4069 is a term of the sequence.
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MATHEMATICA
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f[n_] := Flatten[IntegerDigits[FactorInteger[n]]]; Select[Range[2, 11000], f[ # ] == Reverse[f[ # ]] &]
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CROSSREFS
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Cf. A067599, A067598.
Sequence in context: A014449 A098060 A154040 this_sequence A095797 A091436 A032822
Adjacent sequences: A066982 A066983 A066984 this_sequence A066986 A066987 A066988
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 01 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 08 2002
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