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 A355434 #8 Jul 02 2022 14:37:49
%S A355434 1,8,48,1518,5828,28032,304260,290783,1255500,4325170,11135837,
%T A355434 18567909,321903029,1394350275,287946949,1659945758,38882519234
%N A355434 a(n) is the least start of exactly n consecutive numbers k that are sqrt(k)-smooth (A048098), or -1 if no such run exists.
%e A355434 a(2) = 8 since 8 and 9 are in A048098, 7 and 10 are not, and 8 is the least number with this property.
%t A355434 smQ[n_] := FactorInteger[n][[-1, 1]]^2 <= n; seq[len_, nmax_] := Module[{s = Table[0, {len}], v = {1}, n = 2, c = 0, m}, While[c <= len && n <= nmax, If[smQ[n], v = Join[v, {n}], m = Length[v]; v = {}; If[0 <= m <= len && s[[m]] == 0, c++; s[[m]] = n - m]]; n++]; s]; seq[6, 10^5]
%Y A355434 Cf. A048098, A355433.
%K A355434 nonn,more
%O A355434 1,2
%A A355434 _Amiram Eldar_, Jul 02 2022