a(n) = (2*(-4)^((p-3)/4) + 1)/p, where p is the n-th prime congruent to 3 mod 4.
A318908
a(n) = (2*(-4)^((p-3)/4) + 1)/p, where p is the n-th prime congruent to 3 mod 4.
Terms
- a(0) =1a(1) =-1a(2) =3a(3) =27a(4) =-89a(5) =-1057a(6) =48771a(7) =-178481a(8) =9099507a(9) =128207979a(10) =-483939977a(11) =-6958934353a(12) =26494256091
External references
- oeis: A318908