OFFSET
1,1
MATHEMATICA
Select[Range[4000], MemberQ[Partition[IntegerDigits[#], 2, 1], {4, 7}] && !MemberQ[Partition[IntegerDigits[#-1], 2, 1], {4, 7}]&] (* Harvey P. Dale, Nov 29 2012 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved