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A111678
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a(n+1) = least palindrome not already used that is either a divisor or multiple of a(n) such that the ratios a(n+1)/a(n) are all distinct.
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0
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1, 2, 6, 3, 33, 11, 44, 4, 88, 22, 616, 7, 161, 16261, 101, 505, 5, 515, 515515, 55, 5005, 77, 1001, 6006, 66, 2112, 8, 232, 25752, 111, 777, 20202, 666666, 9, 171, 43434, 82177128, 99, 3663, 54945, 333, 15651, 141, 27072, 282, 29892, 212, 25652, 121
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..49.
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EXAMPLE
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3 is not followed by 9 because 9/3 = 3 = a(3)/a(2).
3 is not followed by 12, 15, 18, 21, 24, 27, or 30 because none of these are palindromes.
88 is not followed by 8 because 8/88 = 1/11 = a(8)/a(7).
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CROSSREFS
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Sequence in context: A304087 A284003 A172031 * A206429 A101819 A177761
Adjacent sequences: A111675 A111676 A111677 * A111679 A111680 A111681
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KEYWORD
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base,nonn,easy,less
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AUTHOR
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Amarnath Murthy, Aug 16 2005
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EXTENSIONS
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Edited and extended David Wasserman, Feb 11 2009
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STATUS
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approved
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