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A164806
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a(n) = smallest number which has in its Spanish name the letter "r" in the n-th position,or -1 if no such number exists.
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0
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-1, 3, 0, 40, 4, -1, 1040, 23, 3003, 33, 24, 53, 34, 44, 54, 133, 124, 153, 134, 144, 154, 253, 234, 244, 254, 354, 444, 454, 1354, 1444, 1454, 2354, 2444, 2454, 3454, 4444, 4454
(list;
graph;
refs;
listen;
history;
text;
internal format)
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