Lucky numbers with size of gaps equal to 20 (upper terms).

Terms

a(0) =957a(1) =1797a(2) =2943a(3) =3003a(4) =3027a(5) =3153a(6) =3747a(7) =4227a(8) =4695a(9) =4761a(10) =5211a(11) =5547a(12) =5637a(13) =6621a(14) =7629a(15) =7737a(16) =8253a(17) =8535a(18) =9915a(19) =9957a(20) =10173a(21) =10311a(22) =10341a(23) =11157a(24) =12357a(25) =12519a(26) =12699a(27) =13677a(28) =13893a(29) =14775