a(n) = prime(n)*prime(n-1) - 1.

Terms

a(0) =1a(1) =5a(2) =14a(3) =34a(4) =76a(5) =142a(6) =220a(7) =322a(8) =436a(9) =666a(10) =898a(11) =1146a(12) =1516a(13) =1762a(14) =2020a(15) =2490a(16) =3126a(17) =3598a(18) =4086a(19) =4756a(20) =5182a(21) =5766a(22) =6556a(23) =7386a(24) =8632a(25) =9796a(26) =10402a(27) =11020a(28) =11662a(29) =12316