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 A181667 #34 Dec 14 2019 21:28:57
%S A181667 1,5,11,11,17,17,41,41,41,41,41,41,19421,19421,333491,601037,601037,
%T A181667 5237651,9063641,12899891,24073871,24073871,28537121,67374467,
%U A181667 67374467,67374467,67374467,146452961,13236860171,13236860171,17959429571,57391479317,57391479317
%N A181667 Least integer m > 0 such that none of the first n primes divides any value of the polynomial x^2 + x + m.
%C A181667 All the elements of this sequence with n > 2 are congruent mod 30 to one of the polynomials x^2 + x + 11 or x^2 + x + 17.
%C A181667 The elements of the sequence have been taken from A060392, see below.
%H A181667 William P. Orrick, <a href="/A181667/b181667.txt">Table of n, a(n) for n = 1..59</a>
%H A181667 M. J. Jacobson, Jr., <a href="http://pages.cpsc.ucalgary.ca/~jacobs/PDF/mthesis.pdf">Master's Thesis</a>, University of Manitoba, 1995. (See Table 6.6, which lists values of 4a(n)-1.)
%e A181667 x^2 + x + 11 takes the values 11, 13, 17, 23, 31, 41, 53, 67, 83, ... never divisible by any of the primes 2, 3, or 5.
%Y A181667 a(n) equals min_{k > n} A060392(k).
%K A181667 nonn
%O A181667 1,2
%A A181667 _Esteban Crespi de Valldaura_, Feb 04 2011
%E A181667 a(29) corrected and more terms added by _William P. Orrick_, Mar 17 2017