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 A348891 #25 Oct 12 2022 08:24:28 %S A348891 1,2,5,12,11,22,84,1368,73,589,15057,2520,28209 %N A348891 Minimal absolute value of determinant of a nonsingular n X n symmetric Toeplitz matrix using the first n prime numbers. %H A348891 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A348891%2BA350955%2B6.py">A348891+A350955+6.py</a> %H A348891 Wikipedia, <a href="http://en.wikipedia.org/wiki/Toeplitz_matrix">Toeplitz Matrix</a> %e A348891 a(3) = 12: %e A348891 2 3 5 %e A348891 3 2 3 %e A348891 5 3 2 %e A348891 a(4) = 11: %e A348891 2 5 3 7 %e A348891 5 2 5 3 %e A348891 3 5 2 5 %e A348891 7 3 5 2 %e A348891 a(5) = 22: %e A348891 2 3 5 7 11 %e A348891 3 2 3 5 7 %e A348891 5 3 2 3 5 %e A348891 7 5 3 2 3 %e A348891 11 7 5 3 2 %o A348891 (Python) %o A348891 from itertools import permutations %o A348891 from sympy import Matrix, prime %o A348891 def A348891(n): return min(d for d in (abs(Matrix([p[i:0:-1]+p[0:n-i] for i in range(n)]).det()) for p in permutations(prime(i) for i in range(1,n+1))) if d > 0) # _Chai Wah Wu_, Jan 28 2022 %Y A348891 Cf. A350932, A350955. %K A348891 nonn,hard,more %O A348891 0,2 %A A348891 _N. J. A. Sloane_ and _Stefano Spezia_, Jan 28 2022 %E A348891 a(9) from _Alois P. Heinz_, Jan 28 2022 %E A348891 a(10)-a(12) from _Lucas A. Brown_, Aug 31 2022