# [Python 3], 45 bytes <!-- language-all: lang-python --> lambda n:[1]+[f"{j}{j+1}"for j in range(1,n)] [Try it online!](https://tio.run/##K6gsycjPM/6fZhvzPycxNyklUSHPKtowVjs6Tak6q7Y6S9uwViktv0ghSyEzT6EoMS89VcNQJ08z9n9BUWZeiUaahqGBgabmfwA "Python 3 – Try It Online") [Python 3]: https://docs.python.org/3/