1, repeat number: a continuous string of numbers or repeated numbers, such as 88888888, 6666666, etc.
2. Meaningful Numbers: Choose numbers with special or symbolic meanings, such as birthdays, anniversaries and lucky numbers.
3. Pinyin numbers: convert Chinese characters into numbers, and replace the pronunciation of Chinese characters with the pronunciation of numbers. 13800 138000 (for life).
4. Seek good fortune and avoid evil: according to the theory of geomantic omen or traditional culture, choose the number combination that can bring good luck, such as the number combination of eight characters.
5. Simple and easy to remember: choosing a simple and easy-to-remember number combination can facilitate memory and use, such as four consecutive numbers or similar number combinations.