



7, 13, 43, 31, 211, 157, 307, 757, 307, 1483, 1723, 3541, 1723, 5113, 3907, 8191, 3541, 8011, 1723, 6007, 5113, 5113, 14281, 5113, 14281, 8011, 3541, 28057, 20593, 20593, 5113, 37831, 28057, 17293, 14281, 8011, 12433, 28057, 20593, 14281, 24181, 10303, 46441
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OFFSET

1,1


COMMENTS

These primes are neither sorted nor uniqued. They are listed in the order found in A259184.


LINKS

Robert Price, Table of n, a(n) for n = 1..1737
OEIS Wiki, Cyclotomic Polynomials at x=n, n! and sigma(n)


FORMULA

a(n) = A259184(A259185(n)).


MAPLE

with(numtheory): A259186:=n>`if`(isprime(1  sigma(n) + sigma(n)^2), 1  sigma(n) + sigma(n)^2, NULL): seq(A259186(n), n=1..200); # Wesley Ivan Hurt, Jul 09 2015


MATHEMATICA

Select[Table[1  DivisorSigma[1, n] + DivisorSigma[1, n]^2, {n, 10000}], PrimeQ]
Select[Table[Cyclotomic[6, DivisorSigma[1, n]], {n, 10000}], PrimeQ]


CROSSREFS

Cf. A000203, A259184, A259185.
Sequence in context: A097444 A241718 A259184 * A151781 A224502 A047977
Adjacent sequences: A259183 A259184 A259185 * A259187 A259188 A259189


KEYWORD

easy,nonn


AUTHOR

Robert Price, Jun 20 2015


STATUS

approved



