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A048344
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a(n) * a(n)_reversed is a palindrome (and a(n) is not palindromic).
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3
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12, 21, 102, 112, 122, 201, 211, 221, 1002, 1011, 1012, 1021, 1022, 1101, 1102, 1112, 1121, 1201, 1202, 1211, 2001, 2011, 2012, 2021, 2101, 2102, 2111, 2201, 10002, 10011, 10012, 10021, 10022, 10102, 10111, 10112, 10121, 10202, 10211, 11001
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Does any term in this sequence have any digit greater than 2? [From Harvey P. Dale, Nov 05 2011]
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
P. De Geest, Palindromic Products of Non Palindromic Integers and their Reversals
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EXAMPLE
| E.g. 10021 x 12001 = 120262021 is a palindrome.
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MATHEMATICA
| palQ[n_]:=Module[{idn=IntegerDigits[n], ridn, idn2}, ridn=Reverse[idn]; idn2 = IntegerDigits[ n FromDigits[ridn]]; idn!=ridn&&idn2==Reverse[idn2]]; Select[ Range[11100], palQ] (* From Harvey P. Dale, Nov 05 2011 *)
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PROG
| (Haskell)
a048344 n = a048344_list !! (n-1)
a048344_list = filter f a029742_list where
f x = a136522 (x * a004086 x) == 1
-- Reinhard Zumkeller, Oct 09 2011
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CROSSREFS
| Cf. A048343.
Cf. A004086, A136522, A029742.
Sequence in context: A071263 A137480 A157157 * A039402 A043225 A111066
Adjacent sequences: A048341 A048342 A048343 * A048345 A048346 A048347
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KEYWORD
| nonn,base,nice
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Feb 15 1999.
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EXTENSIONS
| Offset corrected by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 09 2011
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