Indices k such that s_k(4) is a (probable) prime, where s_k(4) = 4*s_{k-1}(4) - s_{k-2}(4), k >= 2, s_0(4) = 1, s_1(4) = 5.
A299100
Indices k such that s_k(4) is a (probable) prime, where s_k(4) = 4*s_{k-1}(4) - s_{k-2}(4), k >= 2, s_0(4) = 1, s_1(4) = 5.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =14a(6) =18a(7) =146a(8) =216a(9) =293a(10) =704a(11) =1143a(12) =1530a(13) =1593a(14) =2924a(15) =7163a(16) =9176a(17) =9489a(18) =11531a(19) =39543a(20) =50423a(21) =60720a(22) =62868a(23) =69993a(24) =69995a(25) =88103a(26) =88163a(27) =104606a(28) =164441a(29) =178551
External references
- oeis: A299100