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 A085399 #8 Sep 04 2022 23:03:33 %S A085399 2,3,7,5,31,3,127,17,73,11,12207031,13,8191,43,151,257,131071,46441, %T A085399 524287,61681,368089,683,11111111111111111111111,241, %U A085399 705429635566498619547944801,2731,262657,15790321,7369130657357778596659,331,2147483647,65537,599479,43691 %N A085399 Let Cn(x) be the n-th cyclotomic polynomial; a(n) is the first prime Cn(x) after Cn(1). %H A085399 Jinyuan Wang, <a href="/A085399/b085399.txt">Table of n, a(n) for n = 1..396</a> %F A085399 a(n) = Phi(n,A085398(n)) where Phi(n,k) is the n-th cyclotomic polynomial evaluated at k. - _Jinyuan Wang_, Sep 04 2022 %e A085399 a(11)=12207031 because C11(x) is composite for x=2,3,4 and C11(5)=12207031 is prime. %Y A085399 Cf. A084732, A085398, A307687. %K A085399 nonn %O A085399 1,1 %A A085399 _Don Reble_, Jun 28 2003 %E A085399 More terms from _Jinyuan Wang_, Sep 04 2022