OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1250
MATHEMATICA
Flatten[Position[Partition[If[MemberQ[Partition[IntegerDigits[#], 2, 1], {4, 5}], 1, 0]&/@Range[3500], 2, 1], {0, 1}]]+1 (* Harvey P. Dale, Aug 14 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved