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A089347 Primes of the form identical digits followed by a 1. 6
11, 31, 41, 61, 71, 331, 661, 881, 991, 2221, 3331, 4441, 6661, 33331, 99991, 333331, 3333331, 9999991, 33333331, 6666666661, 44444444441, 555555555551, 5555555555551, 7777777777771, 222222222222222221, 333333333333333331 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[ FromDigits /@ Flatten[ Table[ PadLeft[{1}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 18}], 1], PrimeQ[ # ] &] (* Robert G. Wilson v, Nov 15 2003 *)
CROSSREFS
Sequence in context: A040983 A040979 A181182 * A287312 A240896 A040985
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 05 2003
EXTENSIONS
More terms from Ray Chandler and Robert G. Wilson v, Nov 07 2003
STATUS
approved

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Last modified March 3 11:34 EST 2024. Contains 370511 sequences. (Running on oeis4.)