login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100903 Numbers n such that (10^n-1)^2-2 is prime. 0
1, 8, 21, 123, 4299, 6128, 11760, 18884, 40293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Next term > 70000.

LINKS

Table of n, a(n) for n=1..9.

S. Harvey, Carol and Kynea Primes.

PROG

(PARI) is(n)=ispseudoprime((10^n-1)^2-2) \\ Charles R Greathouse IV, Feb 19 2016

CROSSREFS

Sequence in context: A220611 A297340 A220580 * A240648 A231525 A228756

Adjacent sequences:  A100900 A100901 A100902 * A100904 A100905 A100906

KEYWORD

nonn,more

AUTHOR

Ray Chandler, Nov 21 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)