a(n) is the least number k such that exactly fraction 1/n of the members of the reduced residue system mod k are prime, or 0 if there is no such k.
A307711
a(n) is the least number k such that exactly fraction 1/n of the members of the reduced residue system mod k are prime, or 0 if there is no such k.
Terms
- a(0) =3a(1) =31a(2) =97a(3) =331a(4) =1009a(5) =3067a(6) =11513a(7) =27403a(8) =64621a(9) =185617a(10) =480853a(11) =1333951a(12) =3524431a(13) =9558361a(14) =26080333a(15) =70411483a(16) =189961939
External references
- oeis: A307711