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A043044
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Palindromes that start with 9.
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3
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9, 99, 909, 919, 929, 939, 949, 959, 969, 979, 989, 999, 9009, 9119, 9229, 9339, 9449, 9559, 9669, 9779, 9889, 9999, 90009, 90109, 90209, 90309, 90409, 90509, 90609, 90709, 90809, 90909, 91019, 91119, 91219, 91319, 91419, 91519, 91619, 91719, 91819, 91919
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Subsequence of A002113 (palindromic numbers). Union of A128375 (palindromic primes starting with a digit 9) and A222729 (palindromic composite numbers starting with a digit 9). - Jaroslav Krizek, Mar 12 2013
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LINKS
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MATHEMATICA
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palQ[n_Integer, base_Integer] := Module[{idn = IntegerDigits[n, base]}, idn == Reverse[idn]]; Select[Range[0, 100000], IntegerDigits[#][[1]] == 9 && palQ[#, 10] &] (* T. D. Noe, Mar 12 2013 *)
Select[Range[100000], PalindromeQ[#]&&IntegerDigits[#][[1]]==9&] (* Harvey P. Dale, Oct 13 2022 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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