The winning Connecticut Play4 numbers for October 17, 2021 were: day 5-4-5-9; night 5-1-3-0.
Sum is the digits added together (5+5+0 = 10). Root sum keeps adding until one digit is left (10 → 1+0 = 1) — many regular players track it in their notebooks. Odd/Even marks each digit O or E (5-5-0 = OOE). High/Low marks 0–4 as L and 5–9 as H (5-5-0 = HHL).
Sum is the digits added together (5+5+0 = 10). Root sum keeps adding until one digit is left (10 → 1+0 = 1) — many regular players track it in their notebooks. Odd/Even marks each digit O or E (5-5-0 = OOE). High/Low marks 0–4 as L and 5–9 as H (5-5-0 = HHL).
| Date | Draw | Numbers | Sum | Root |
|---|---|---|---|---|
| Oct 17, 2021 | Night | 5-1-3-0 | 9 | 9 |
| Oct 17, 2021 | Day | 5-4-5-9 | 23 | 5 |
| Oct 16, 2021 | Night | 0-1-9-4 | 14 | 5 |
| Oct 16, 2021 | Day | 2-1-3-0 | 6 | 6 |
| Oct 15, 2021 | Night | 5-5-9-4 | 23 | 5 |
| Oct 15, 2021 | Day | 6-3-4-4 | 17 | 8 |
| Oct 14, 2021 | Night | 4-1-0-3 | 8 | 8 |
| Oct 14, 2021 | Day | 2-5-0-7 | 14 | 5 |
| Oct 13, 2021 | Night | 4-9-5-4 | 22 | 4 |
| Oct 13, 2021 | Day | 2-3-4-9 | 18 | 9 |
| Oct 12, 2021 | Night | 1-3-2-9 | 15 | 6 |
| Oct 12, 2021 | Day | 3-2-2-6 | 13 | 4 |
| Oct 11, 2021 | Night | 8-7-8-7 | 30 | 3 |
| Oct 11, 2021 | Day | 9-9-3-3 | 24 | 6 |