OFFSET
1,1
COMMENTS
Lower density is 3/(40*Pi^2), upper density is 20/(27*Pi^2). - Charles R Greathouse IV, Nov 05 2017
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[900], SquareFreeQ[#]&&First[IntegerDigits[#]]==8&] (* Harvey P. Dale, Feb 22 2011 *)
PROG
(PARI) is(n)=n>81 && digits(n)[1]==8 && 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
Definition clarified by Harvey P. Dale, Feb 22 2011
STATUS
approved