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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106808 Numbers n such that 4440011 * 10^n - 1 is prime. 0
12, 44, 75, 237, 3186, 4379, 5535, 6363, 13707, 14463 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

These are primes with square digits and they have all been certified. No more terms up to 37000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 4440011*10^14463-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 3, base 1+sqrt(3) 4440011*10^14463-1 is prime! (268.8294s+0.0548s)

LINKS

Table of n, a(n) for n=1..10.

R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations.

PROG

(PARI) is(n)=ispseudoprime(4440011*10^n-1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A061246.

Sequence in context: A116187 A009790 A009519 * A296181 A007899 A100156

Adjacent sequences:  A106805 A106806 A106807 * A106809 A106810 A106811

KEYWORD

nonn

AUTHOR

Jason Earls, May 18 2005

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 December 4 21:58 EST 2020. Contains 338941 sequences. (Running on oeis4.)