Numbers of the form 7^i*11^j.

Terms

a(0) =1a(1) =7a(2) =11a(3) =49a(4) =77a(5) =121a(6) =343a(7) =539a(8) =847a(9) =1331a(10) =2401a(11) =3773a(12) =5929a(13) =9317a(14) =14641a(15) =16807a(16) =26411a(17) =41503a(18) =65219a(19) =102487a(20) =117649a(21) =161051a(22) =184877a(23) =290521a(24) =456533a(25) =717409a(26) =823543a(27) =1127357a(28) =1294139a(29) =1771561