Intersection of A013917 and A013918.

Terms

a(0) =2a(1) =281a(2) =25237a(3) =1359329a(4) =1603597a(5) =6706397a(6) =8300797a(7) =32106383a(8) =33262057a(9) =33312781a(10) =37233373a(11) =57922687a(12) =87938423a(13) =124285471a(14) =143031971a(15) =144784201a(16) =179684179a(17) =185763283a(18) =186515239a(19) =229240489a(20) =237863777a(21) =248536159a(22) =280322407a(23) =298010851a(24) =375529801a(25) =481405411a(26) =488236271a(27) =498472207