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Smallest multiple of n which is the concatenation of n successive numbers in descending order, or 0 if no such number exists.

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`%I #4 Dec 05 2013 19:56:21
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`%S 1,32,321,5432,98765,765432,22212019181716,98765432,987654321,
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`%T 19181716151413121110,2019181716151413121110,1312111098765432,
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`%U 19181716151413121110987,2928272625242322212019181716
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`%N Smallest multiple of n which is the concatenation of n successive numbers in descending order, or 0 if no such number exists.
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`%e a(7) = 22212019181716 is the concatenation of 22,21,20,19,18,17 and 16 and is divisible by 7.
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`%Y Cf. A087343.
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`%K base,nonn
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`%O 1,2
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`%A _Amarnath Murthy_, Sep 06 2003
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`%E More terms from _David Wasserman_, May 10 2005
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