a(n) = 3*p^2+39*p+344+24*gcd(p-1,3)+11*gcd(p-1,4)+2*gcd(p-1,5), where p = prime(n).

Terms

a(0) =471a(1) =536a(2) =684a(3) =860a(4) =1192a(5) =1476a(6) =1944a(7) =2264a(8) =2876a(9) =4068a(10) =4540a(11) =6012a(12) =7064a(13) =7664a(14) =8852a(15) =10908a(16) =13136a(17) =14012a(18) =16520a(19) =18292a(20) =19296a(21) =22244a(22) =24296a(23) =27648a(24) =32472a(25) =34964a(26) =36284a(27) =38912a(28) =40356a(29) =43128