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 A347109 #12 Sep 01 2021 01:41:17 %S A347109 31,151,181,421,601,661,691,751,811,1051,1171,1231,1291,1321,1531, %T A347109 1621,1741,1831,1861,2221,2281,2371,2521,2551,2971,3061,3181,3271, %U A347109 3301,3361,3391,3511,3691,4051,4111,4201,4231,4561,4621,4831,4951 %N A347109 Primes p congruent to 1 mod 15 such that the 15 X 15 integer circulant determinants take the form 3^2*p or 5^2*p. %H A347109 Bishnu Paudel and Chris Pinner, <a href="https://arxiv.org/abs/2108.03198">Integer circulant determinants of order 15</a>, arXiv:2108.03198 [math.NT], 2021. See p. 3. %Y A347109 Subsequence of A132230. %K A347109 nonn,more %O A347109 1,1 %A A347109 _Michel Marcus_, Aug 18 2021