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 A084732 #11 Sep 04 2022 23:03:42 %S A084732 3,7,31,127,12207031,8191,131071,524287,11111111111111111111111, %T A084732 7369130657357778596659,2147483647, %U A084732 19013087418896543607659206142267856546797091624826498592389251997,7538867501749984216983927242653776257689563451,26656068987980386414408582952871386493955339704241 %N A084732 Let p be the n-th prime; Cp(x) be the p-th cyclotomic polynomial (x^p-1)/(x-1); a(n) is the first prime Cp(x) after Cp(1). %F A084732 a(n) = A085399(prime(n)). %e A084732 a(5)=12207031 because 11 is the 5th prime; C11(x) is composite for x=2,3,4 and C11(5)=12207031 is prime. %Y A084732 Cf. A066180, A085399. %K A084732 nonn %O A084732 1,1 %A A084732 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 14 2003 %E A084732 Edited by _Don Reble_, Jun 28 2003