Because you mentioned it, I'll put a buck on it, see what happens.
I have no mathmatical formulas, and there can be long stretches, but the QPs come through for me about 6 times a year on average, playing a couple a day. I've had nice hits a few times, if you chart my "career" as since about Feb 2007. I usually bet at least twice on each number, and 5x or more on strong hunches. About four times a year I've hit for a grand. But many times the big hits came after holding on to sentimental favorite numbers for months. At the beginning of 2012, two of my main three favorites (503 and 374 )came bam-bam and I got about 2Gs out of them because I had str/bx bets x5 and they came straight. On the other hand, just last week, I stood at the counter, decided not to play my 503 and it came str! Still waiting on the str form of 254, my third of my three faves. I also play across the border in New York often, so if I'm not careful, it drains the $$ pretty quick. Just when I check myself and ease off, bam bam bam the numbers come in.
I check the NJ Lottery sites search to find numbers that havent been out in at least 3-4 months. Some havent been out in more than a year! I had written five " long out" numbers down - did not play them - and they all came out in a period of two weeks.
calab and Kola2121, and a few others on this thread give great tips on pairs, so maybe adding that third digit makes it easier.
Today, I'm on long out doubles 779 668 and 488 and wheeling them because its only 1.50 each to cover str hits on doubles.
Also waiting for 159 in any combo, and trips 888 and 777 Good luck!