Smallest nonempty set S containing prime divisors of 7k+4 for each k in S.
A020609
Smallest nonempty set S containing prime divisors of 7k+4 for each k in S.
Terms
- a(0) =3a(1) =5a(2) =11a(3) =13a(4) =19a(5) =23a(6) =107a(7) =137a(8) =251a(9) =457a(10) =587a(11) =3203
External references
- oeis: A020609