OFFSET
1,1
LINKS
V. Raman, Table of n, a(n) for n = 1..10000
FORMULA
a(n) >> n log^3 n. - Charles R Greathouse IV, Sep 07 2012
MATHEMATICA
t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 3, 10*n + 7, 10*n + 9}, AppendTo[t, n]], {n, 0, 4978}]; t (* T. D. Noe, Sep 03 2012 *)
Select[Range[4100], CompositeQ[10#+1]&&AllTrue[10#+{3, 7, 9}, PrimeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 14 2019 *)
PROG
(Magma) [k:k in [1..4100]| not IsPrime(10*k+1) and forall{m:m in [3, 7, 9]| IsPrime(10*k+m)}]; // Marius A. Burtea, Feb 02 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
V. Raman, Sep 03 2012
STATUS
approved