306: triangular and a nonaon (ab reference woaw) number 434: multiple of 217, in which 217 is the number that each wimpy kid book has 436: 109 x 436, iykyk 451: wedderburn-etherington number and a decagon number, wedderburn etherington was a mathematician but doesn't have an image on wikipedia. hence the question mark 489: i think you know the drill
