OFFSET
1,1
COMMENTS
a(29) > 2.5*10^5. - Robert Price, Apr 12 2015
LINKS
EXAMPLE
10^4 - 71 = 9929 which is a prime number.
MATHEMATICA
nMax=1000; Do[If[PrimeQ[10^n-71], Print[n]], {n, nMax}]
PROG
(PARI) is(n)=ispseudoprime(10^n-71) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert Price, Dec 21 2010
EXTENSIONS
a(24:25)=52317,53804 from Robert Price, Apr 25 2011
a(26)-a(28) from Kamada data by Robert Price, Apr 12 2015
STATUS
approved