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A085512 Numbers n such that (89 + 10^(2*n+1))/99 is prime. 0
1, 6, 7, 15, 18, 19, 22, 174, 427, 484, 1702, 2380 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
No more terms < 1700. - David Wasserman, Feb 03 2005
No more terms < 5500. - L. Joris Perrenet, Mar 17 2020
LINKS
EXAMPLE
a(2)=6 because (1/99)*(89 + 10^(2*6+1)) = 101010101011, a prime.
PROG
(PARI) is(n)=isprime((89+10^(2*n+1))/99) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A047915 A084382 A315842 * A165767 A292348 A319185
KEYWORD
nonn,easy
AUTHOR
Jason Earls, Aug 19 2003
EXTENSIONS
More terms from David Wasserman, Feb 03 2005
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)