Smallest prime a such that (a*b)^2 + a*b -1 is prime with b prime = 2^(2*n) - 2^n - 1, see A098845 for n.
A107639
Smallest prime a such that (a*b)^2 + a*b -1 is prime with b prime = 2^(2*n) - 2^n - 1, see A098845 for n.
Terms
- a(0) =5a(1) =7a(2) =31a(3) =11a(4) =5a(5) =3a(6) =809a(7) =661a(8) =139a(9) =73a(10) =521a(11) =701a(12) =131a(13) =487a(14) =89a(15) =211a(16) =733a(17) =3011a(18) =311a(19) =8837a(20) =2837a(21) =8831a(22) =1733a(23) =401a(24) =983a(25) =17881a(26) =1783a(27) =19553a(28) =13859
External references
- oeis: A107639