Numbers n of the form p^2+p+1 (for prime p) such that n^2+n+1 is also prime.

Terms

a(0) =57a(1) =381a(2) =993a(3) =4557a(4) =16257a(5) =32943a(6) =49953a(7) =58323a(8) =109893a(9) =135057a(10) =167691a(11) =214833a(12) =237657a(13) =453603a(14) =503391a(15) =564753a(16) =658533a(17) =678153a(18) =780573a(19) =995007a(20) =1248807a(21) =1516593a(22) =1746363a(23) =2218611a(24) =2400951a(25) =3465183a(26) =3738423a(27) =4340973a(28) =4750221a(29) =5232657