A043939 Numbers n such that 1 and 2 occur juxtaposed in the base 8 representation of n but not of n+1.

10, 17, 74, 87, 143, 145, 202, 209, 266, 273, 330, 337, 394, 401, 458, 465, 522, 529, 586, 599, 703, 714, 721, 778, 785, 842, 849, 906, 913, 970, 977, 1034, 1041, 1151, 1167, 1169, 1226, 1233, 1290, 1297, 1354, 1361, 1418