|
|
A044740
|
|
Numbers n such that string 2,7 occurs in the base 10 representation of n but not of n+1.
|
|
0
|
|
|
27, 127, 227, 279, 327, 427, 527, 627, 727, 827, 927, 1027, 1127, 1227, 1279, 1327, 1427, 1527, 1627, 1727, 1827, 1927, 2027, 2127, 2227, 2279, 2327, 2427, 2527, 2627, 2799, 2827, 2927, 3027, 3127, 3227, 3279, 3327, 3427
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {2, 7}]>0, 1, 0], {n, 4000}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, May 25 2015 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|