a(n) is the least prime p such that (p^2-2*n)/(2*n-1) and (p^2+2*n)/(2*n+1) are both prime, or 0 if such p does not exist.
A344463
a(n) is the least prime p such that (p^2-2*n)/(2*n-1) and (p^2+2*n)/(2*n+1) are both prime, or 0 if such p does not exist.
Terms
- a(0) =2a(1) =0a(2) =239a(3) =251a(4) =2069a(5) =131a(6) =521a(7) =0a(8) =2243a(9) =379a(10) =643a(11) =40849a(12) =89101a(13) =11717a(14) =81839a(15) =18787a(16) =659a(17) =0a(18) =2887a(19) =41081a(20) =199261a(21) =13931a(22) =4231a(23) =223439a(24) =17443a(25) =953a(26) =3499a(27) =6689a(28) =122131a(29) =298777
External references
- oeis: A344463