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A044012
Numbers n such that 1 and 9 occur juxtaposed in the base 10 representation of n but not of n+1.
+0
1
19, 91, 119, 199, 219, 291, 319, 391, 419, 491, 519, 591, 619, 691, 719, 791, 819, 891, 919, 991, 1019, 1091, 1119, 1199, 1219, 1291, 1319, 1391, 1419, 1491, 1519, 1591, 1619, 1691, 1719, 1791, 1819, 1891, 1999, 2019, 2091
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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