This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A048344 a(n) * a(n)_reversed is a palindrome (and a(n) is not palindromic). 3
 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; text; internal format)
 OFFSET 1,1 COMMENTS Does any term in this sequence have any digit greater than 2? [From Harvey P. Dale, Nov 05 2011] LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 EXAMPLE E.g. 10021 x 12001 = 120262021 is a palindrome. 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] (* Harvey P. Dale, Nov 05 2011 *) 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 (Python) A048344_list = [] for n in range(1, 10**5): ....s = str(n) ....s2 = str(n)[::-1] ....if s != s2: ........s3 = str(n*int(s2)) ........if s3 == s3[::-1]: ............A048344_list.append(n) # Chai Wah Wu, Sep 08 2014 CROSSREFS Cf. A048343. Cf. A004086, A136522, A029742. Sequence in context: A228766 A157157 A218043 * A039402 A043225 A111066 Adjacent sequences:  A048341 A048342 A048343 * A048345 A048346 A048347 KEYWORD nonn,base,nice AUTHOR Patrick De Geest, Feb 15 1999 EXTENSIONS Offset corrected by Reinhard Zumkeller, Oct 09 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 20 05:42 EDT 2019. Contains 328247 sequences. (Running on oeis4.)