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%I #12 Nov 11 2019 13:47:53
%S 101,9091,909091,9901,909090909090909091,99990001,
%T 909090909090909090909090909091,999999000001,1111111111111111111,
%U 11111111111111111111111,9999999900000001,9090909090909090909090909090909090909090909090909091
%N Primes of the form Phi(k, -10), where Phi is the cyclotomic polynomial.
%H Robert Price, <a href="/A291990/b291990.txt">Table of n, a(n) for n = 1..18</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,-10], {k, 3, 100}], PrimeQ[#] &]
%Y Cf. A138920.
%K nonn
%O 1,1
%A _Robert Price_, Sep 07 2017
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