Just change the last digit to the next block number. I checked the first 20 and there are only block rewards in those.
An unnecessary process. You can use the link I gave above and then order by ascending block number. The first non Coinbase transaction is in block 170. There is then a single transaction in blocks 181, 182, 183, 187, 221, 248, 496, 524, and 545. The first block with multiple transactions is 546. So feel free to jump to those block numbers and skip the endless clicking.