A044445 Numbers n such that string 0,3 occurs in the base 4 representation of n but not of n+1.

19, 35, 51, 67, 79, 83, 99, 115, 131, 143, 147, 163, 179, 195, 207, 211, 227, 243, 259, 271, 275, 291, 319, 323, 335, 339, 355, 371, 387, 399, 403, 419, 435, 451, 463, 467, 483, 499, 515, 527, 531, 547, 575, 579, 591, 595, 611