A074757 Numbers n such that tau(n) = (tau(n+1)+tau(n-1))/2.

34, 46, 62, 74, 86, 94, 142, 188, 202, 214, 218, 231, 243, 244, 262, 278, 302, 356, 375, 394, 422, 423, 428, 436, 446, 459, 478, 494, 584, 596, 604, 621, 628, 634, 664, 698, 716, 837, 861, 885, 903, 916, 922, 944, 956, 982, 1004, 1017, 1018, 1028, 1042, 1052