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 A322493 #14 Dec 31 2018 03:50:45 %S A322493 15,33,91,213,213,893,893,1343 %N A322493 Start of first occurrence of n consecutive odd squarefree composite numbers. %C A322493 The sequence is finite because among 9 or more consecutive odd numbers there is always a multiple of 3*3. - _Rémy Sigrist_, Dec 19 2018 %e A322493 a(1) = 15 = A024556(1). %e A322493 a(2) = 33 because 33 = 3*11 and 35 = 5*7 is the smallest pair of odd squarefree composite numbers. 31 and 37 are prime. %e A322493 a(8) = 1343: 1343=17*79, 1345=5*269, 1347=3*449, 1349=19*71, 1351=7*193, 1353=3*11*41, 1355=5*271, 1357=23*59, whereas 1341=3^2*149 and 1359=3^2*151 are not squarefree. %t A322493 a[n_] := For[k = 1, True, k = k+2, If[AllTrue[Range[k, k+2(n-1), 2], CompositeQ[#] && SquareFreeQ[#]&], Return[k]]]; %t A322493 Array[a, 8] (* _Jean-François Alcover_, Dec 31 2018 *) %Y A322493 Cf. A024556, A321617. %K A322493 nonn,fini,full %O A322493 1,1 %A A322493 _Hugo Pfoertner_, Dec 19 2018