Number 31

In El Gordo de la Primitiva under the 5/54 + 1/9 · since Jan 2010 rules — 866 draws, 5 from 1–54.

81times drawn · chance expected 80 +0.10σ

8draws waiting · a wait this long: 51% for any number

10.7average wait between appearances · chance says 10.8

52longest completed wait · 43% chance of one at least that long

31 is drawn as often as chance explains

Drawn 81 times in 866 draws against 80.2 expected, +0.10σ. Each draw is independent: after 8 draws away it is exactly as likely tonight as a number drawn yesterday.

Number 31, draw by draw

Drawn 81 times in 866 draws · average wait 10.7 draws · longest completed wait 52 · waiting 8 draws now

a completed wait — darker is longer the wait still running — a lower bound, not a finished gap

Where it lands in a sorted draw

Sort a draw and 31 has a favourite seat — chance gives a large number the high positions more often. That is the shape of sorting, not of the machine.

1st smallest4 · chance 2.4
2nd smallest14 · chance 14.7
3rd smallest29 · chance 30.4
4th smallest22 · chance 25.8
5th smallest12 · chance 7.6

Every position’s lane →

The company it keeps

Seen most often with these — chance gives every partner about 6.1 shared draws, and the leaders are simply the ones that came out ahead this time.

24 54 10 7 37 50

It has shared a draw with every one of the other 53 numbers; chance expected about 0.1 still unmet by now. Every pair →

How many people play it

Under the crowd model, 31 is picked about 1.22× as often as an indifferent choice — 15th most popular of 54. That changes nothing about whether it comes up, and everything about how many ways a jackpot on it would be shared.

Numbers 1–31 — the birthday zone ×1.22

The model and its sources → · What people believe about 31 →

Every draw it appeared in

Date	Wait	Position	The draw
2026-08-16	1	4th	7 8 11 31 35
2026-08-09	37	4th	22 25 28 31 32
2025-11-23	11	3rd	10 22 31 51 52
2025-09-07	6	5th	6 11

What this cannot tell you

Nothing here predicts the next draw. A number’s history is a record of a fair machine’s past, and the machine keeps none of it: 31 is drawn with probability 5/54 tonight whatever it did last week.

2020-12-06	6	2nd	12 31 32 51 52
2020-10-25	5	4th	6 16 18 31 39
2020-09-20	1	2nd	7 31 37 48 54
2020-09-13	13	2nd	6 31 50 52 54
2020-06-14	12	3rd	3 21 31 32 54
2020-01-12	20	1st	31 34 44 45 47
2019-08-25	11	3rd	17 24 31 34 36
2019-06-09	1	5th	2 7 13 27 31
2019-06-02	14	3rd	10 14 31 42 43
2019-02-24	8	3rd	4 15 31 37 49
2018-12-30	10	3rd	2 7 31 41 50
2018-10-21	28	5th	2 8 12 24 31
2018-04-08	4	4th	22 23 30 31 33
2018-03-11	10	3rd	4 9 31 37 48
2017-12-31	18	4th	10 12 26 31 52
2017-08-27	8	3rd	9 21 31 45 46
2017-07-02	2	3rd	9 27 31 32 34
2017-06-18	17	3rd	5 13 31 42 52
2017-02-19	5	2nd	7 31 37 38 39
2017-01-15	35	3rd	3 21 31 39 46
2016-05-15	5	4th	4 6 28 31 47
2016-04-10	5	4th	10 11 24 31 50
2016-03-06	6	4th	5 12 30 31 48
2016-01-24	5	5th	3 10 19 27 31
2015-12-20	2	5th	4 16 23 24 31
2015-12-06	5	2nd	7 31 33 34 48
2015-11-01	11	5th	6 10 11 21 31
2015-08-16	5	2nd	30 31 35 37 41
2015-07-12	6	4th	3 13 23 31 39
2015-05-31	7	4th	18 19 27 31 54
2015-04-12	5	4th	17 25 29 31 42
2015-03-08	5	3rd	17 24 31 38 53
2015-02-01	4	5th	2 7 14 21 31
2015-01-04	3	4th	10 22 28 31 54
2014-12-14	12	3rd	5 9 31 35 48
2014-09-21	21	5th	9 18 26 30 31
2014-04-27	11	4th	4 10 23 31 51
2014-02-09	1	4th	14 23 26 31 36
2014-02-02	41	1st	31 44 47 51 52
2013-04-21	4	3rd	25 28 31 41 51
2013-03-24	14	4th	6 22 30 31 51
2012-12-16	14	4th	9 20 28 31 50
2012-09-09	1	2nd	25 31 32 33 49
2012-09-02	15	2nd	29 31 36 40 53
2012-05-20	29	3rd	5 30 31 36 50
2011-10-30	9	3rd	24 30 31 38 44
2011-08-28	12	3rd	13 26 31 33 46
2011-06-05	22	3rd	7 24 31 47 51
2011-01-02	11	5th	1 8 20 28 31
2010-10-17	5	2nd	28 31 34 37 47
2010-09-12	1	3rd	2 3 31 41 49
2010-09-05	9	4th	16 21 29 31 54
2010-07-04	2	4th	1 14 27 31 48
2010-06-20	5	3rd	15 28 31 45 52
2010-05-16	15	5th	4 11 22 29 31
2010-01-31	1	4th	14 22 25 31 35
2010-01-24	—	3rd	14 19 31 33 54