The Most Popular Lottery Numbers in Australia (And Why Avoiding Them Pays)

When millions of people make choices that feel personal and random, patterns emerge. Lottery number selection is one of the clearest examples of this: research across multiple countries consistently shows that human-selected lottery numbers cluster in predictable ways. Australian players are no exception.

Understanding which numbers other players favour is directly useful. If your combination wins, you share the prize with everyone who holds the same numbers. Playing less popular numbers reduces the expected number of other winners sharing your prize pool.

The birthday cluster: numbers 1 to 31

In Saturday Lotto (pool: 1 to 45), numbers 32 to 45 cover roughly 31 percent of the pool but are dramatically under-represented in human-selected tickets. In Oz Lotto (pool: 1 to 47), numbers 32 to 47 represent about 34 percent of the pool and are similarly under-picked. In Powerball (main pool: 1 to 35), numbers 32 to 35 are underused relative to even their small proportion.

Any ticket loaded with numbers from 1 to 31 is sharing its combination space with a disproportionately large share of the player population. Winning with those numbers means sharing with more co-winners on average.

Lucky 7 and multiples

7 is the most commonly selected "lucky number" across Western cultures, including Australia. It appears on lottery tickets with noticeably higher frequency than its neighbours 6 or 8. Multiples of 7 (14, 21, 28, 35) also get more attention than they should receive from a purely random selection.

Numbers that feel culturally significant also tend to cluster: 3, 7, 9, 11, and to some extent 13 (though 13 is often avoided as unlucky, which makes it under-selected and therefore slightly more contrarian). Round numbers like 10, 20, 30, and 40 attract disproportionate play.

The diagonal problem

One of the most cited examples of human lottery bias comes from a UK National Lottery draw where the winning numbers formed a diagonal on the standard play slip: 7, 14, 21, 28, 35, and 42. An unusually high number of tickets matched, because players like the visual pattern of a diagonal when filling out their slip. The prize was split many more ways than a draw with the same jackpot would typically be.

Australian lottery play slips follow a similar grid format. Patterns that look neat on the grid: diagonals, rows, columns, corner squares, and L-shapes, are all over-represented among human-selected tickets. These combinations look distinctive to the eye but are not rare in the player population.

Arithmetic sequences

Evenly spaced sequences are another human preference. Combinations where numbers are separated by a consistent gap (such as 3, 9, 15, 21, 27, 33) appeal to players because they feel orderly. These sequences are over-represented in human selections for the same reason that diagonals are: they look structured and feel less random than they are.

From the draw's perspective, an arithmetic sequence has identical odds to any other combination. From the prize-sharing perspective, an arithmetic sequence is a poor choice because many other players have the same idea.

What the research says

Academic research on lottery number selection began in earnest in the 1990s. Clotfelter and Cook's 1991 study of a US daily numbers game found that winning combinations attracted far more tickets when they included popular sequences and birthday numbers, resulting in meaningfully smaller individual payouts. Later work by Haigh (1997) and others confirmed the birthday effect is robust across multiple lottery formats and countries.

Australian researchers and lottery operators have noted similar patterns in local data. The consistent finding is that roughly 70 percent of players include at least some numbers from 1 to 31, and that visual patterns on play slips are more common than true randomness would produce.

How the contrarian generator works

The Outnumber number generator uses a probability weighting model based on documented patterns in lottery player behaviour. Numbers above 31 receive higher selection weight than the birthday-heavy lower range. Arithmetic sequences and numbers that form visual patterns on the play slip are penalised.

The result is a combination that is statistically valid (every number in the pool is eligible for selection) but is generated with a bias towards combinations that fewer other players will have chosen. The contrarian score displayed with each generated set estimates how unpopular that particular combination is relative to the typical player population.

The number heatmap tool on this site visualises which numbers are appearing most frequently in our aggregate user generation data. You can use it to see in real time which numbers the Outnumber user base tends to avoid and which ones are appearing more often.