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A171149
Numbers k such that 3 + 10^k + 3*100^k is prime.
0
0, 1, 2, 3, 19, 49, 92, 160, 595, 3175, 4043, 7423, 8488, 19341, 21637
OFFSET
1,3
COMMENTS
No more terms up to k=4000.
PROG
(PARI) is(n)=ispseudoprime(3+10^n+3*100^n) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A051089 A289860 A248702 * A157042 A128968 A153409
KEYWORD
nonn,hard,more,changed
AUTHOR
Jason Earls, Dec 04 2009
EXTENSIONS
Offset changed to 1 by Georg Fischer, Jan 03 2021
a(11)-a(13) from Michael S. Branicky, May 12 2023
a(14)-a(15) from Michael S. Branicky, Oct 31 2024
STATUS
approved