ucla mathematician skip garibaldi. >> numerology is in no way a science.ng two crucial factors that we expect in science. so, one is, why should adding up the digits in your birth date have any effect, any correlation whatsoever, with what's going to happen to you in the next year? and the second thing it's lacking is controlled experiment to test the claims. >> rorter: oh, party pooper. still, we wanted to know, do some lottery numbers come up more frequently than others, making them by definition lucky numbers? my "20/20" colleague, melissa, did a little research. so what'd you do? >> so out of the 50 most recent drawings over 100 million dollars i took, all the winning numbers and tallied up how many times they all showed up. the number 10 came up 10 times number 31, 12 times. those have to be lucky numbers. on the other hand, the number two came up just twice. and the number 40? just once. glynis isn't surprised. >> it is literally the breakdown of the number. 'cause here's what's interesting. the number four. but the purity of the number four can have