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 A043998 Numbers k such that 0 and 3 occur juxtaposed in the base-10 representation of k but not of k+1. 1
 30, 103, 130, 203, 230, 309, 330, 403, 430, 503, 530, 603, 630, 703, 730, 803, 830, 903, 930, 1003, 1039, 1103, 1130, 1203, 1230, 1309, 1330, 1403, 1430, 1503, 1530, 1603, 1630, 1703, 1730, 1803, 1830, 1903, 1930, 2003, 2039 (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 With[{j = 0, k = 3}, Position[Partition[Array[Boole[Total@ {SequenceCount[#, {j, k}], SequenceCount[#, {k, j}]} > 0] &@ IntegerDigits[#] &, 2100], 2, 1], {1, 0}][[All, 1]]] (* Michael De Vlieger, Aug 27 2021 *) CROSSREFS Sequence in context: A280911 A043218 A039395 * A101056 A316362 A081370 Adjacent sequences:  A043995 A043996 A043997 * A043999 A044000 A044001 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified December 5 09:34 EST 2021. Contains 349543 sequences. (Running on oeis4.)