A044536 Numbers n such that string 2,3 occurs in the base 7 representation of n but not of n+1.

17, 66, 115, 125, 164, 213, 262, 311, 360, 409, 458, 468, 507, 556, 605, 654, 703, 752, 801, 811, 881, 899, 948, 997, 1046, 1095, 1144, 1154, 1193, 1242, 1291, 1340, 1389, 1438, 1487, 1497, 1536, 1585, 1634, 1683, 1732, 1781