OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[2600], PrimeQ[3#+1] && PrimeQ[3#+5] && PrimeQ[3#+7] &] (* Stefano Spezia, Sep 23 2024 *)
PROG
(PARI) j=[]; for(n=1, 10000, if(isprime(3*n+1) && isprime(3*n+5) && isprime(3*n+7), j=concat(j, n))); j
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 17 2001
STATUS
approved