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A176987
Primes of the form 10^n-27.
2
73, 9973, 9999973, 99999999999973, 99999999999999999973, 9999999999999999999973, 99999999999999999999999999973, 9999999999999999999999999999973, 9999999999999999999999999999999999999973
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[10^n - 27, {n, 2, 500}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)
Select[Table[FromDigits[PadLeft[{7, 3}, n, 9]], {n, 2, 40}], PrimeQ] (* Harvey P. Dale, Jul 08 2024 *)
PROG
(Magma) [a: n in [2..250]|IsPrime(a) where a is 10^n-27];
CROSSREFS
Cf. A108329.
Sequence in context: A177094 A116241 A105322 * A174747 A364301 A210382
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 11 2010
STATUS
approved