OFFSET
1,3
COMMENTS
a(11) > 2*10^5. - Robert Price, Aug 19 2015
LINKS
Makoto Kamada, Prime numbers of the form 800...003.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
FORMULA
a(n) = A101056(n-1) + 1, for n>1.
EXAMPLE
For n = 2 we have 8*10^1+3 = 8*10+3 = 83, which is prime.
MATHEMATICA
Do[ If[ PrimeQ[ 8*10^n + 3], Print[ n ]], {n, 0, 10000}]
PROG
(PARI) is(n)=ispseudoprime(8*10^n+3) \\ Charles R Greathouse IV, Jun 12 2017
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
Prepended a(1) = 0 by Robert Price, Aug 19 2015
a(9)-a(10) from Robert Price, Aug 19 2015
STATUS
approved