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 A088875 #5 Feb 16 2025 08:32:51
%S A088875 1,3,4,5,6,9,12,14,17,82,86,157,158,180,210,236,245,368,462,842,1034,
%T A088875 3512,3977,8636
%N A088875 Cyclotomic(n,-n) is prime.
%C A088875 This is a generalization of A056826. See A088817 for another generalization. Note that (n^n+1)/(n+1) = cyclotomic(n,-n) when n is prime. Also note that, for odd n>1, cyclotomic(n,-n) = cyclotomic(2n,n) and for n a multiple of 4, cyclotomic(n,-n) = cyclotomic(n,n).
%C A088875 Some of the larger entries may only correspond to probable primes.
%H A088875 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CyclotomicPolynomial.html">Cyclotomic Polynomial</a>
%t A088875 Do[p=Prime[n]; If[PrimeQ[Cyclotomic[n, -n]], Print[p]], {n, 100}]
%Y A088875 Cf. A056826 ((n^n+1)/(n+1) is prime), A070519 (cyclotomic(n, n) is prime), A088817 (cyclotomic(2n, n) is prime).
%K A088875 hard,nonn
%O A088875 1,2
%A A088875 _T. D. Noe_, Oct 20 2003