The sequence "1, 3, 5, 7" consists of the first four odd numbers. Odd numbers are integers that cannot be evenly divided by 2, meaning they leave a remainder of 1 when divided. This sequence is often used in basic mathematics to teach counting and number patterns. In addition to their mathematical significance, odd numbers like 1, 3, 5, and 7 appear in various cultural contexts. For example, in many traditions, odd numbers are considered lucky or special. They are also commonly used in games, such as dice or card games, where odd-numbered outcomes can influence gameplay.