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Search: id:A158642
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| A158642 |
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Palindromic numbers which are the product of a number n and its reversal (n written backwards) |
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+0
2
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| 0, 1, 4, 9, 121, 252, 484, 10201, 12321, 14641, 20502, 23632, 26962, 40804, 44944, 1002001, 1113111, 1226221, 1234321, 1357531, 2005002, 2126212, 2216122, 2249422, 2347432, 2429242, 4008004, 4229224, 100020001
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Apart from 3 which produces 9 (3*3), all the other numbers n which satisfy the definition are formed by digits 0, 1 and 2 only. Subset of A002113.
Every term has an odd number of digits. - Floris van Doorn, Sep 25 2009
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LINKS
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Floris P. van Doorn, Table of n, a(n) for n=0,...,10126 (every term with at most 27 digits)
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EXAMPLE
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0*0=0; 1*1=1; 2*2=4; 3*3=9; 11*11=121; 12*21=252; 22*22=484; 101*101=10201; 102*201=20502; etc.
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CROSSREFS
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Cf. A002113
Sequence in context: A156317 A115676 A115667 this_sequence A131760 A002779 A028817
Adjacent sequences: A158639 A158640 A158641 this_sequence A158643 A158644 A158645
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KEYWORD
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easy,nonn,base
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Mar 23 2009
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EXTENSIONS
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Corrected by Floris van Doorn (florisvandoorn(AT)hotmail.com), Sep 25 2009
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