Minimum value unattainable as the sum of 2 attained values of a*b*c with a,b,c 0..n integers.

Terms

a(0) =3a(1) =7a(2) =23a(3) =23a(4) =71a(5) =71a(6) =289a(7) =311a(8) =311a(9) =311a(10) =479a(11) =479a(12) =1559a(13) =1559a(14) =1559a(15) =1559a(16) =4253a(17) =5637a(18) =7142a(19) =7469a(20) =8843a(21) =10103a(22) =13445a(23) =13445a(24) =15457a(25) =18043a(26) =18191a(27) =18191a(28) =27313a(29) =28442