If a, b are in the sequence, so is ab+3.

Terms

a(0) =2a(1) =7a(2) =17a(3) =37a(4) =52a(5) =77a(6) =107a(7) =122a(8) =157a(9) =217a(10) =247a(11) =262a(12) =292a(13) =317a(14) =367a(15) =437a(16) =497a(17) =527a(18) =542a(19) =587a(20) =632a(21) =637a(22) =737a(23) =752a(24) =857a(25) =877a(26) =887a(27) =997a(28) =1057a(29) =1087