text: Furthermore , any even perfect number except the first one is the ( ( 2p +1 ) \/ 3 ) th centered nonagonal number as well as the sum of the first 2 ( pâ ' 1 ) \/ 2 odd cubes :
simplified: Also , any even perfect number except the first one is the sum of the first 2 ( n 1 ) \/ 2 odd cubes :