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

Terms

a(0) =21a(1) =50a(2) =112a(3) =220a(4) =364a(5) =544a(6) =760a(7) =1104a(8) =1566a(9) =2046a(10) =2664a(11) =3280a(12) =3784a(13) =4512a(14) =5618a(15) =6726a(16) =7686a(17) =8844a(18) =9940a(19) =10950a(20) =12324a(21) =13944a(22) =16020a(23) =18430a(24) =20200a(25) =21424a(26) =22684a(27) =23980a(28) =26668a(29) =30988