Smallest number containing n syllables in UK English.

Terms

a(0) =1a(1) =7a(2) =11a(3) =27a(4) =77a(5) =107a(6) =111a(7) =127a(8) =177a(9) =777a(10) =1127a(11) =1177a(12) =1777a(13) =7777a(14) =11777a(15) =27777a(16) =77777a(17) =107777a(18) =111777a(19) =127777a(20) =177777a(21) =777777a(22) =1127777a(23) =1177777a(24) =1777777a(25) =7777777a(26) =11777777a(27) =27777777a(28) =77777777a(29) =107777777