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A199819
Primes of the form 10^n-9^n
2
19, 271, 5217031, 68618940391, 8649148282327007911, 95289871302753755165078396311
OFFSET
1,1
LINKS
MATHEMATICA
Select[10^Range[3000]-9^Range[3000], PrimeQ]
PROG
(Magma) [ a: n in [0..400] | IsPrime(a) where a is 10^n-9^n ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Nov 21 2011
STATUS
approved