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A164812
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a(n) = smallest number which has in its Spanish name the letter "v" in the n-th position,or -1 if no such number exists.
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20, -1, 90, 9, -1, 1090, 120, 3020, 19, 29, 220, 39, 49, 59, 119, 129, 409, 139, 149, 159, 329, 239, 249, 259, 359, 449, 459, 1359, 1449, 1459, 2359, 2449, 2459, 3459, 4449, 4459
(list; graph; refs; listen; history; internal format)
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