A046957 Cos(n) decreases monotonically to 0 (or sec(n) increases).

1, 5, 11, 699, 1409, 2119, 2829, 3539, 4249, 4959, 5669, 6379, 7089, 7799, 8509, 9219, 9929, 10639, 11349, 12059, 12769, 13479, 14189, 14899, 15609, 16319, 17029, 17739, 18449, 19159, 19869, 20579, 21289, 21999, 22709, 23419, 24129