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A110584 Numbers n such that the string 999n is prime. 1
23, 29, 61, 71, 89, 91, 101, 133, 149, 169, 181, 199, 217, 221, 233, 239, 269, 287, 307, 329, 331, 359, 371, 377, 389, 431, 433, 437, 451, 491, 499, 521, 529, 541, 553, 563, 599, 611, 613, 623, 631, 653, 667, 671, 683, 721, 727, 749, 763, 769, 773, 809, 853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

If n=169 then 999n = 999169 (prime).

MATHEMATICA

Select[Range[900], PrimeQ[999*10^IntegerLength[#]+#]&] (* Harvey P. Dale, Sep 05 2017 *)

CROSSREFS

Sequence in context: A046124 A157677 A092518 * A115396 A180538 A227217

Adjacent sequences:  A110581 A110582 A110583 * A110585 A110586 A110587

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Sep 12 2005

EXTENSIONS

More terms from Vincenzo Librandi, Mar 27 2010

STATUS

approved

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Last modified April 9 06:05 EDT 2020. Contains 333343 sequences. (Running on oeis4.)