



3, 13, 43, 157, 73, 241, 157, 211, 601, 601, 421, 601, 2971, 1483, 8191, 6163, 3307, 2971, 6481, 8191, 28393, 3907, 28393, 6481, 8191, 28393, 37057, 26407, 12211, 28393, 31153, 113233, 19183, 83233, 113233, 37057, 28393, 71023, 22651, 83233, 37057, 154057
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OFFSET

1,1


COMMENTS

These primes are neither sorted nor uniqued. They are listed in the order found in A258774.


LINKS

Robert Price, Table of n, a(n) for n = 1..2122
OEIS Wiki, Cyclotomic Polynomials at x=n, n! and sigma(n)


FORMULA

a(n) = A258774(A258775(n)).


MATHEMATICA

Select[Table[1 + DivisorSigma[1, n] + DivisorSigma[1, n]^2, {n, 1, 10000}], PrimeQ]
Select[Table[Cyclotomic[3, DivisorSigma[1, n]], {n, 1, 10000}], PrimeQ]


PROG

(Magma) [a: n in [1..300]  IsPrime(a) where a is 1+SumOfDivisors(n)+ SumOfDivisors(n)^2]; // Vincenzo Librandi, Jun 10 2015


CROSSREFS

Cf. A000203, A258774, A258775.
Sequence in context: A049173 A049156 A054771 * A201710 A019008 A062609
Adjacent sequences: A258773 A258774 A258775 * A258777 A258778 A258779


KEYWORD

nonn


AUTHOR

Robert Price, Jun 09 2015


STATUS

approved



