The Feast of Saint Patrick! Rather than me rewrite Wikipedia, here’s the direct link.
There are a good number of solutions to this, so it should be doable by hand.
Solutions are below the image.
SPOILER SOLUTIONS!
SAINT_first | PATTY_second | FEAST_third |
---|---|---|
14865 | 24550 | 39415 |
14756 | 24660 | 39416 |
24875 | 14550 | 39425 |
24657 | 14770 | 39427 |
26857 | 16770 | 43627 |
19365 | 29550 | 48915 |
29375 | 19550 | 48925 |
39276 | 19660 | 58936 |
37185 | 27550 | 64735 |
29157 | 39770 | 68927 |
21684 | 51440 | 73124 |
51496 | 21660 | 73156 |
48513 | 28330 | 76843 |
49613 | 29330 | 78943 |
59623 | 19330 | 78953 |
14538 | 64880 | 79418 |
72943 | 12330 | 85273 |
21684 | 71440 | 93124 |
41268 | 51880 | 93148 |
51278 | 41880 | 93158 |
37621 | 57110 | 94731 |
38721 | 58110 | 96831 |
58741 | 38110 | 96851 |
78543 | 18330 | 96873 |
78325 | 18550 | 96875 |
74361 | 24110 | 98471 |