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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227170 Numbers n such that (16^n + 15^n)/31 is prime. 4
3, 5, 13, 1439, 1669, 37691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are prime.

a(7) > 10^5. - Robert Price, Aug 26 2013

LINKS

Table of n, a(n) for n=1..6.

PROG

(PARI) is(n)=ispseudoprime((16^n+15^n)/31) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

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

Sequence in context: A200769 A128341 A177007 * A028942 A278314 A289622

Adjacent sequences:  A227167 A227168 A227169 * A227171 A227172 A227173

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 October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)