OFFSET
0,4
COMMENTS
a(n) for n even appear to be smaller than a(n) for n odd. - Chai Wah Wu, Oct 19 2024
a(33) > 10^13, unless it is 0. - Lucas A. Brown, Nov 15 2024
LINKS
Lucas A. Brown, Python program.
EXAMPLE
The fourth differences begin: -3, 3, 1, -6, 7, -5, 3, 0, -2, ... so a(4) = 8
MATHEMATICA
nn=10000;
u=Table[Differences[Select[Range[nn], SquareFreeQ], k], {k, 2, 16}];
mnrm[s_]:=If[Min@@s==1, mnrm[DeleteCases[s-1, 0]]+1, 0];
m=Table[Position[u[[k]], 0][[1, 1]], {k, mnrm[Union[First/@Position[u, 0]]]}]
CROSSREFS
KEYWORD
nonn,more,hard,changed
AUTHOR
Gus Wiseman, Oct 18 2024
EXTENSIONS
a(15)-a(20) from Chai Wah Wu, Oct 19 2024
a(21)-a(32) from Lucas A. Brown, Nov 15 2024
STATUS
approved