This page contains numbers appearing in recreational mathematics.

## List of numbers appearing in recreational mathematics

- The number
**121**is the fourth largest undulating square number; this has been proved by David Moews. **125**is a Canada number.- The number
**343**is the largest known undulating perfect power with an exponent larger than 2. - The number
**484**is the third largest undulating square number; this has been proved by David Moews. **581**is a Canada number.- The number
**676**is the second largest undulating square number; this has been proved by David Moews. **728**is the smaller number in the first Smith brother pair.**729**is the larger number in the first Smith brother pair.**8,549**and**16,999**are the two largest Canada numbers.- The number
**69,696**is the largest undulating square number; this has been proved by David Moews.