This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A258430 #24 Sep 08 2022 08:46:12
%S A258430 2,5,7,13,19,13,29,19,43,37,61,43,41,31,73,61,43,97,79,73,73,73,61,97,
%T A258430 127,97,73,97,127,109,181,113,157,103,211,193,163,109,281,241,211,181,
%U A258430 157,313,337,241,271,139,337,193,181,223,229,151,373,193,241,379
%N A258430 Primes in A088580.
%C A258430 These primes are neither sorted nor uniqued. They are listed in the order found in A088580.
%H A258430 Robert Price, <a href="/A258430/b258430.txt">Table of n, a(n) for n = 1..2967</a>
%H A258430 OEIS Wiki, <a href="https://oeis.org/wiki/Cyclotomic Polynomials at x=n, n! and sigma(n)">Cyclotomic Polynomials at x=n, n! and sigma(n)</a>
%F A258430 a(n) = A088580(A065512(n)). - _Michel Marcus_, Jun 04 2015
%p A258430 with(numtheory): A258430:=n->`if`(isprime(1+sigma(n)), 1+sigma(n), NULL): seq(A258430(n), n=1..300); # _Wesley Ivan Hurt_, Jul 09 2015
%t A258430 Select[Table[1 + DivisorSigma[1, n], {n, 10000}], PrimeQ]
%o A258430 (Magma) [a: n in [1..300] | IsPrime(a) where a is 1 + SumOfDivisors(n)]; // _Vincenzo Librandi_, May 30 2015
%o A258430 (PARI) select(x->isprime(x), vector(200, n, 1+sigma(n))) \\ _Michel Marcus_, Jun 04 2015
%Y A258430 Cf. A088580, A065512.
%K A258430 nonn
%O A258430 1,1
%A A258430 _Robert Price_, May 29 2015