a(n) is the least prime number p such that every sum of two or more divisors of p^n is composite.
A160994
a(n) is the least prime number p such that every sum of two or more divisors of p^n is composite.
Terms
- a(0) =3a(1) =7a(2) =7a(3) =19a(4) =19a(5) =139a(6) =151a(7) =211a(8) =211a(9) =211a(10) =421a(11) =2311a(12) =2311a(13) =92401a(14) =120121a(15) =120121a(16) =180181a(17) =2312311
External references
- oeis: A160994