n-th nonnegative integer k satisfying cos(k) > cos(k+1).

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =7a(5) =8a(6) =13a(7) =14a(8) =15a(9) =19a(10) =20a(11) =21a(12) =25a(13) =26a(14) =27a(15) =31a(16) =32a(17) =33a(18) =34a(19) =38a(20) =39a(21) =40a(22) =44a(23) =45a(24) =46a(25) =50a(26) =51a(27) =52a(28) =57a(29) =58