|
|
A044004
|
|
Numbers k such that 0 and 9 occur juxtaposed in the base-10 representation of k but not of k+1.
|
|
0
|
|
|
90, 109, 190, 209, 290, 309, 390, 409, 490, 509, 590, 609, 690, 709, 790, 809, 890, 909, 990, 1009, 1099, 1109, 1190, 1209, 1290, 1309, 1390, 1409, 1490, 1509, 1590, 1609, 1690, 1709, 1790, 1809, 1890, 1909, 1990, 2009, 2099
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 9}]>0 || SequenceCount[ IntegerDigits[n], {9, 0}]>0, 1, 0], {n, 2200}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 28 2021 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|