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A171719
Numbers n such that 10^n*(8+3*10^n)+3 is prime.
0
1, 2, 4, 8, 17, 517, 581, 665, 890, 4901, 5230, 7515
OFFSET
1,2
COMMENTS
Values corresponding to n=4901, n=5230, and n=7515 were all certified Fermat and Lucas PRPs with WinPFGW and the latter two (>10k digits) were submitted to Lifchitz's Top PRPs database. No more terms up to n=8100.
PROG
(PARI) is(n)=ispseudoprime(10^n*(8+3*10^n)+3) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A113153 A372543 A255999 * A185178 A351471 A229718
KEYWORD
more,nonn
AUTHOR
Jason Earls, Dec 16 2009
STATUS
approved