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A201966
Primes of the form identical digits preceded by an 11.
1
11, 113, 11777, 1133333, 1199999, 113333333, 11777777777, 1111111111111111111, 11111111111111111111111, 1177777777777777777777777, 113333333333333333333333333, 1177777777777777777777777777777777777777777777777
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OFFSET
1,1
LINKS
Vincenzo Librandi,
Table of n, a(n) for n = 1..16
MATHEMATICA
Select[FromDigits/@Flatten[Table[PadRight[{11}, i, #]&/@{1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 1200}], 1], PrimeQ[#]&]
CROSSREFS
Sequence in context:
A048553
A110799
A088089
*
A121196
A251261
A332729
Adjacent sequences:
A201963
A201964
A201965
*
A201967
A201968
A201969
KEYWORD
nonn
,
base
,
less
AUTHOR
Vincenzo Librandi
, Dec 10 2011
STATUS
approved
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Last modified June 5 19:06 EDT 2023. Contains 363138 sequences. (Running on oeis4.)