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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A125885 Numbers k for which k^7+k^6-1 is prime. 15
2, 4, 12, 17, 27, 39, 45, 46, 72, 94, 105, 106, 122, 126, 147, 149, 151, 156, 160, 161, 166, 169, 171, 172, 192, 194, 204, 205, 209, 230, 235, 242, 252, 260, 264, 266, 276, 280, 285, 306, 309, 319, 330, 335, 357, 371, 387, 400, 402, 411, 422, 439, 442, 451, 459 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Do[If[PrimeQ[x^7 + x^6 - 1], Print[x]], {x, 1, 200}]

PROG

(PARI) is(n)=isprime(n^7+n^6-1) \\ Charles R Greathouse IV, May 15 2013

CROSSREFS

Cf. A000040, A045546, A125881, A125882, A125883, A125884.

Sequence in context: A233191 A192533 A085931 * A067929 A349080 A337837

Adjacent sequences:  A125882 A125883 A125884 * A125886 A125887 A125888

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 14 2006

EXTENSIONS

More terms from Amiram Eldar, Mar 18 2020

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 13:06 EST 2021. Contains 349526 sequences. (Running on oeis4.)