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 A044006 Numbers k such that 1 and 3 occur juxtaposed in the base-10 representation of k but not of k+1. 1
 13, 31, 113, 139, 213, 231, 319, 331, 413, 431, 513, 531, 613, 631, 713, 731, 813, 831, 913, 931, 1013, 1031, 1113, 1139, 1213, 1231, 1399, 1413, 1431, 1513, 1531, 1613, 1631, 1713, 1731, 1813, 1831, 1913, 1931, 2013, 2031 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..10000 MATHEMATICA SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 3}]>0 || SequenceCount[ IntegerDigits[n], {3, 1}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 18 2019 *) CROSSREFS Sequence in context: A039403 A062339 A043226 * A179034 A179035 A007628 Adjacent sequences:  A044003 A044004 A044005 * A044007 A044008 A044009 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified September 26 17:00 EDT 2021. Contains 347670 sequences. (Running on oeis4.)