Least positive integer k such that prime(k*n) has the form p^2 - 2 with p prime, or 0 if no such k exists.
A253257
Least positive integer k such that prime(k*n) has the form p^2 - 2 with p prime, or 0 if no such k exists.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =1a(4) =3a(5) =12a(6) =47a(7) =9a(8) =1a(9) =100a(10) =502a(11) =6a(12) =3a(13) =1817a(14) =1a(15) =362a(16) =3141a(17) =4a(18) =104a(19) =50a(20) =14157a(21) =251a(22) =222a(23) =3a(24) =27a(25) =76a(26) =25a(27) =5423a(28) =416a(29) =73
External references
- oeis: A253257