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Primes of the form Phi(k, -3), where Phi is the cyclotomic polynomial.
1

%I #9 Nov 11 2019 13:48:45

%S 7,61,13,547,73,398581,1093,757,23535794707,6481,797161,4561,

%T 374857981681,530713,42521761,368089,82064241848634269407,47763361,

%U 105919308797935444986721,2413941289,282429005041,56495392933101222275861053369,150094634909578633

%N Primes of the form Phi(k, -3), where Phi is the cyclotomic polynomial.

%H Robert Price, <a href="/A292004/b292004.txt">Table of n, a(n) for n = 1..38</a>

%H Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>

%H <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>

%t Select[Table[Cyclotomic[k,-3], {k, 0, 100}], PrimeQ[#] &]

%Y Cf. A138927.

%K nonn

%O 1,1

%A _Robert Price_, Sep 07 2017