OFFSET
1,1
LINKS
V. Raman, Table of n, a(n) for n = 1..10000
FORMULA
a(n) ~ 0.4 n log n. - Charles R Greathouse IV, Sep 07 2012
MATHEMATICA
t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 9}, AppendTo[t, n]], {n, 0, 677}]; t (* T. D. Noe, Sep 03 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
V. Raman, Sep 03 2012
STATUS
approved