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A164794
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a(n) = smallest number which has in its English name the letter "f" in the n-th position, -1 if such number no exist
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4, -1, 15, -1, -1, 44, 24, 74, -1, -1, 104, 404, 115, 415, 315, 144, 124, 174, 324, 374
(list; graph; refs; listen; history; internal format)
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