Lottery Numbers to Avoid — A Game-by-Game Guide
No number selection changes your odds of winning a lottery — the odds are fixed by game rules. What number choice does affect is how many other players share the jackpot if you win. This guide covers the patterns that Australians most commonly pick for each game, and why avoiding them is worth considering.
Important: The patterns below do not appear more or less often in actual draws — lottery draws are genuinely random. These are patterns that players over-select, meaning if those numbers happen to come up, more tickets share the prize. Avoiding popular patterns reduces expected prize-sharing, not the probability of any individual draw outcome.
Powerball
Full guide →Birthday numbers (1–31)
The most common bias in every lottery worldwide. Around half of all Powerball entries include mainly numbers from 1 to 31 — the date range of a calendar month. With a main pool of 1 to 35, this means numbers 32, 33, 34, and 35 are consistently under-picked. Including several of these will move your set towards the contrarian end of the spectrum.
Lucky 7 as the Powerball
The Powerball barrel runs from 1 to 20. The single most popular pick by a significant margin is 7, followed by 3, 13, and other numbers that feel lucky or significant. Numbers in the 14–20 range are picked far less often. If your main numbers come up alongside a popular Powerball, you will split the jackpot with many more co-winners.
Multiples of common numbers
Sequences like 7, 14, 21, 28, 35 (multiples of 7) or 5, 10, 15, 20, 25, 30 (multiples of 5) are popular because they look deliberate. These patterns are disproportionately represented in ticket sales despite having identical odds to any other combination.
Consecutive runs
Three or more consecutive numbers (e.g. 8, 9, 10 or 22, 23, 24) appear in draws at exactly the rate you would expect from random selection — but many players avoid them, believing they are unlikely. A subset of players deliberately targets them as "contrarian", so consecutive runs are not always as under-picked as they appear.
Saturday Lotto
Full guide →The 1–31 birthday cluster
Saturday Lotto uses a pool of 1 to 45, with six main numbers drawn. Players choosing from birthdays, anniversaries, and lucky dates cluster heavily in the lower half of the pool. Numbers 32 to 45 represent 31% of the pool but are significantly under-selected, making them high-value contrarian picks.
Multiples of 6, 7, and 10
Arithmetic sequences (e.g. 6, 12, 18, 24, 30, 36) are popular because they feel structured. Five or more members of an arithmetic sequence is a strong indicator of a heavily over-picked combination.
All even or all odd
Six all-even numbers (e.g. 4, 12, 18, 24, 32, 40) and six all-odd numbers (e.g. 3, 7, 11, 23, 35, 43) are statistically possible but feel satisfying to some players. Because a subset of players deliberately seeks out all-even or all-odd sets, these patterns can have higher-than-average popularity.
Low-range clusters
Sets where all six numbers are under 25 appear in a disproportionate share of entries. The number 1 is particularly popular — many players use it as an anchor. If you choose 1, balance your set with several numbers above 30.
Oz Lotto
Full guide →Birthday bias in a pool of 47
Oz Lotto draws 7 numbers from 1 to 47. Numbers 32 to 47 make up 34% of the pool but are consistently under-represented in ticket sales. Including three or more numbers above 31 in your selection moves you into clearly contrarian territory.
Lucky number anchors
The numbers 3, 7, 8, 11, and 13 are frequently used as "anchors" in Oz Lotto — players build their other picks around a favourite lucky number. Sets that include 7 and another low single-digit number tend to be over-picked.
Patterns across the full range
A selection of 7 numbers spread evenly across 1–47 (e.g. one from each decade segment) feels mathematically balanced to many players. Because this is a recognisable heuristic, these evenly-spaced sets can be surprisingly popular.
Weekday Windfall
Full guide →Division 1 guaranteed — but lower divisions split
Weekday Windfall guarantees $1 million to every Division 1 winner, so prize-sharing does not affect the top prize. However, divisions 2 to 6 are pari-mutuel — those prizes are split. The same birthday and pattern biases apply to lower-division outcomes, so contrarian selection remains worth considering.
Pool is 1 to 45 — birthday bias strong
The same 1–45 pool as Saturday Lotto, with six numbers drawn. Numbers 32 to 45 are consistently under-picked. The contrarian strategy is identical: spread your numbers across the full range, particularly including some above 31.
Visual patterns on the ticket grid
When lottery numbers are arranged in a physical grid, some players select numbers that form lines, diagonals, or shapes. These visual patterns create small but measurable spikes in popularity for specific number clusters.
Set for Life
Full guide →Birthday bias in a pool of 44
Set for Life draws 8 main numbers from 1 to 44. Numbers 32 to 44 represent 13 of the 44 options — 30% of the pool — but attract far less than 30% of player selections. Numbers 37 to 44 are among the most consistently under-picked across all Australian lotteries.
The lucky 8
Eight is culturally associated with good luck in some communities (particularly East Asian cultures, given that Sydney has a large East Asian population). The number 8 is slightly over-represented in Set for Life entries. Similarly, 18, 28, and 38 can carry mild popularity spikes.
Sticking below 20
With a pool to 44, players who think of lottery as "numbers up to about 40" still often cap their selections around 20 or so. A set where all 8 numbers are between 1 and 22 is quite heavily over-represented compared to random chance.
Let the generator do the avoiding for you
Outnumber's optimised mode weights your number selection away from the most commonly picked combinations — automatically applying the logic in this guide.
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