|
|
A089346
|
|
Primes of the form identical odd digits followed by a 1.
|
|
8
|
|
|
11, 31, 71, 331, 991, 3331, 33331, 99991, 333331, 3333331, 9999991, 33333331, 555555555551, 5555555555551, 7777777777771, 333333333333333331, 1111111111111111111, 77777777777777777771, 11111111111111111111111
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Select[FromDigits/@Flatten[Table[Join[PadLeft[{n}, i, n], {1}], {i, 25}, {n, 1, 9, 2}], 1], PrimeQ] (* Harvey P. Dale, Jul 25 2011 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|