A085512 Numbers k such that (89 + 10^(2*k+1))/99 is prime.

1, 6, 7, 15, 18, 19, 22, 174, 427, 484, 1702, 2380, 6048, 8257

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Example

6 is a term 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

Adjacent sequences: A085509 A085510 A085511 * A085513 A085514 A085515

Keyword

nonn,changed

Author

Jason Earls, Aug 19 2003

Extensions

a(9)-a(10) from David Wasserman, Feb 03 2005

a(11)-a(12) from L. Joris Perrenet

a(13)-a(14) from Michael S. Branicky, Apr 12 2024

Status

approved