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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A291993 Primes of the form Phi(k, -7), where Phi is the cyclotomic polynomial. 1
43, 117307, 2801, 6568801, 29078814248401, 3421093417510114543, 79787519018560501, 16148168401, 1628413557556843, 13564461457, 402488219476647465854701, 13841169553, 11898664849, 655417289594537954307682339857743931943, 33232924804801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..23

Yves Gallot, Cyclotomic polynomials and prime numbers

Index entries for cyclotomic polynomials,values at X

MATHEMATICA

Select[Table[Cyclotomic[k, -7], {k, 0, 100}], PrimeQ[#] &]

CROSSREFS

Cf. A138923.

Sequence in context: A185558 A155477 A212738 * A228546 A125828 A177417

Adjacent sequences:  A291990 A291991 A291992 * A291994 A291995 A291996

KEYWORD

nonn

AUTHOR

Robert Price, Sep 07 2017

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 April 14 05:00 EDT 2021. Contains 342941 sequences. (Running on oeis4.)