Smallest sum of an addition chain for 2n+1.

Terms

a(0) =0a(1) =5a(2) =10a(3) =16a(4) =20a(5) =27a(6) =31a(7) =35a(8) =40a(9) =47a(10) =51a(11) =56a(12) =60a(13) =65a(14) =74a(15) =78a(16) =80a(17) =86a(18) =92a(19) =96a(20) =102a(21) =106a(22) =110a(23) =120a(24) =121a(25) =125a(26) =134a(27) =137a(28) =142a(29) =148