OFFSET
1,1
MATHEMATICA
Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {4, 7}]>0||SequenceCount[IntegerDigits[n, 8], {7, 4}]>0, 1, 0], {n, 1500}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Jun 08 2016 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved