69个
=1开头的5个 + 2开头的6个 + 3开头的7个 + 4开头的8个 + 5开头的9个 + 6开头的10个 + 7开头的9个 + 8开头的8个 + 9开头的7个
= 69个
具体如下：
159,168,177,186,195
249,258,267,276,285,294
339,348,357,366,375,384,393
429,438,447,456,465,474,483,492
519,528,537,546,555,564,573,582,591
609,618,627,636,645,654,663,672,681,690
708,717,726,735,744,753,762,771,780
807,816,825,834,843,852,861,870
906,915,924,933,942,951,960