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A044423
Numbers n such that string 9,1 occurs in the base 10 representation of n but not of n-1.
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91, 191, 291, 391, 491, 591, 691, 791, 891, 910, 991, 1091, 1191, 1291, 1391, 1491, 1591, 1691, 1791, 1891, 1910, 1991, 2091, 2191, 2291, 2391, 2491, 2591, 2691, 2791, 2891, 2910, 2991, 3091, 3191, 3291, 3391, 3491, 3591
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Maintained by
N. J. A. Sloane
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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