a(n) = smallest number m > 0 such that n followed by m 1's yields a prime, or -1 if no such m exists.
A069568
a(n) = smallest number m > 0 such that n followed by m 1's yields a prime, or -1 if no such m exists.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =2a(8) =2a(9) =1a(10) =17a(11) =136a(12) =1a(13) =9a(14) =1a(15) =3a(16) =8a(17) =1a(18) =1a(19) =2a(20) =1a(21) =3a(22) =2a(23) =1a(24) =1a(25) =3a(26) =1a(27) =1a(28) =6a(29) =2
External references
- oeis: A069568