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A044010 Numbers k such that 1 and 7 occur juxtaposed in the base-10 representation of k but not of k+1. 1
17, 71, 117, 179, 217, 271, 317, 371, 417, 471, 517, 571, 617, 671, 719, 771, 817, 871, 917, 971, 1017, 1071, 1117, 1179, 1217, 1271, 1317, 1371, 1417, 1471, 1517, 1571, 1617, 1671, 1799, 1817, 1871, 1917, 1971, 2017, 2071 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 7}]>0 || SequenceCount[ IntegerDigits[n], {7, 1}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Harvey P. Dale, Apr 11 2022 *)
CROSSREFS
Sequence in context: A152295 A039407 A043230 * A106921 A105414 A157910
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified July 17 21:57 EDT 2024. Contains 374377 sequences. (Running on oeis4.)