Numbers k such that 7*(10^(2*k+1)-1)/9 - 3*10^k is prime.
A183179
Numbers k such that 7*(10^(2*k+1)-1)/9 - 3*10^k is prime.
Terms
- a(0) =2a(1) =3a(2) =6a(3) =23a(4) =36a(5) =69a(6) =561a(7) =723a(8) =3438a(9) =4104a(10) =9020a(11) =13977a(12) =19655a(13) =32400
External references
- oeis: A183179