login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227172 Numbers n such that (48^n + 47^n)/95 is prime. 1
13, 31, 631, 5279 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are prime.

a(5) > 10^4.

LINKS

Table of n, a(n) for n=1..4.

PROG

(PARI) is(n)=ispseudoprime((48^n+47^n)/95) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A000978, A057469, A128066, A128335, A128336, A187805, A181141, A187819, A217095.

Sequence in context: A299888 A023304 A247837 * A180757 A214488 A247836

Adjacent sequences:  A227169 A227170 A227171 * A227173 A227174 A227175

KEYWORD

hard,nonn,more

AUTHOR

Jean-Louis Charton, Jul 03 2013

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 12 11:56 EST 2018. Contains 318060 sequences. (Running on oeis4.)