A044591 Numbers n such that string 2,7 occurs in the base 8 representation of n but not of n+1.

23, 87, 151, 191, 215, 279, 343, 407, 471, 535, 599, 663, 703, 727, 791, 855, 919, 983, 1047, 1111, 1175, 1215, 1239, 1303, 1367, 1431, 1535, 1559, 1623, 1687, 1727, 1751, 1815, 1879, 1943, 2007, 2071, 2135, 2199, 2239, 2263