a(n) is the least integer k requiring any combination of at least n 1's or 2's to build using + and *.

A382685

a(n) is the least integer k requiring any combination of at least n 1's or 2's to build using + and *.

Terms

    a(0) =1a(1) =3a(2) =5a(3) =7a(4) =11a(5) =19a(6) =23a(7) =43a(8) =59a(9) =107a(10) =173a(11) =283a(12) =383a(13) =719a(14) =1103a(15) =1439a(16) =3019a(17) =4283a(18) =8563a(19) =14207a(20) =20719a(21) =31667a(22) =52919a(23) =105838a(24) =165749a(25) =290219a(26) =495359a(27) =880799a(28) =1529279a(29) =2417399

External references