OFFSET
1,1
COMMENTS
Lower density is 3/(25*Pi^2), upper density is 10/(9*Pi^2). - Charles R Greathouse IV, Nov 05 2017
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..5000
MATHEMATICA
Table[Select[Range[5*10^n, 6*10^n-1], SquareFreeQ], {n, 0, 2}]//Flatten (* Harvey P. Dale, Apr 15 2017 *)
PROG
(PARI) is(n)=n>4 && digits(n)[1]==5 && issquarefree(n) \\ Charles R Greathouse IV, Nov 05 2017
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 16 2002
EXTENSIONS
More terms from Sascha Kurz, Jan 28 2003
STATUS
approved