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A171735
Numbers n such that 10^n*(2+7*10^n)+7 is prime.
0
1, 2, 4, 19, 25, 47, 266, 2016
OFFSET
1,2
COMMENTS
No more terms up to n=7500.
PROG
(PARI) is(n)=ispseudoprime(10^n*(2+7*10^n)+7) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A153691 A184308 A268338 * A201379 A056727 A154140
KEYWORD
more,nonn
AUTHOR
Jason Earls, Dec 17 2009
STATUS
approved