|
|
A044379
|
|
Numbers n such that string 4,7 occurs in the base 10 representation of n but not of n-1.
|
|
0
|
|
|
47, 147, 247, 347, 447, 470, 547, 647, 747, 847, 947, 1047, 1147, 1247, 1347, 1447, 1470, 1547, 1647, 1747, 1847, 1947, 2047, 2147, 2247, 2347, 2447, 2470, 2547, 2647, 2747, 2847, 2947, 3047, 3147, 3247, 3347, 3447, 3470
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
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
|
|
|
|