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A043243 Numbers k such that 3 and 7 occur juxtaposed in the base-10 representation of k but not of k-1. 0
37, 73, 137, 173, 237, 273, 337, 370, 437, 473, 537, 573, 637, 673, 730, 773, 837, 873, 937, 973, 1037, 1073, 1137, 1173, 1237, 1273, 1337, 1370, 1437, 1473, 1537, 1573, 1637, 1673, 1730, 1773, 1837, 1873, 1937, 1973, 2037 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {3, 7}]>0|| SequenceCount[ IntegerDigits[n], {7, 3}]>0, 1, 0], {n, 2100}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 29 2018 *)
CROSSREFS
Sequence in context: A055604 A135952 A039420 * A044023 A179579 A069204
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 3 10:40 EST 2024. Contains 370511 sequences. (Running on oeis4.)