Numbers k such that ceiling(Pi/arctan(1/k)) = ceiling(k*Pi)+1.

Terms

a(0) =6a(1) =7a(2) =14a(3) =21a(4) =28a(5) =113a(6) =226a(7) =339a(8) =452a(9) =565a(10) =678a(11) =791a(12) =904a(13) =1017a(14) =1130a(15) =1243a(16) =1356a(17) =1469a(18) =1582a(19) =1695a(20) =1808a(21) =1921a(22) =33215a(23) =99532a(24) =364913a(25) =729826a(26) =1725033a(27) =3450066a(28) =5175099a(29) =27235615