Ryukichi (福井竜吉) Fukui
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Born : 1972
Cat. M50 Ultrarunner since 2012
18
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan38,5%
Rank quotient ?This runner's calculation uses 18 eligible race(s): Σ(rank − 1) = 6 533; Σ finishers = 16 949. 6 533 / 16 949 × 100 = 38.55%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed18
Km — ultra races1 619 km
Longest race100,0 km
1st Nara Ultra Marathon — 31/5/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
HISTORY
18 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 31/5/2026 | 1st Nara Ultra Marathon | 100,00 | ×3 |
| ✓ 2 | 14/9/2025 | 23th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 3 | 15/9/2024 | 22th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 4 | 17/9/2023 | 21th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 15/9/2019 | 19th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 6 | 16/9/2018 | 18th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 7 | 16/10/2016 | 22nd River Shimanto 100km | 100,00 | ×3 |
| ✓ 8 | 18/9/2016 | 16th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 9 | 27/9/2015 | 18th Muraoka 100 km Ultra Marathon | 100,00 | ×3 |
| ✓ 10 | 20/9/2015 | 15th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 11 | 29/3/2015 | 1st Osaka Yodogawa 100 km Ultra Marathon | 100,00 | ×3 |
| ✓ 12 | 14/9/2014 | 14th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 13 | 15/9/2013 | 13th Tango 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 14 | 19/5/2024 | 29th Saba Highway Ultramarathon | 77,00 | ×2 |
| ✓ 15 | 28/9/2014 | 17th Muraoka 66 km Ultra Marathon | 66,00 | ×2 |
| ✓ 16 | 29/9/2013 | 16th Muraoka 66 km Ultra Marathon | 66,00 | ×2 |
| ✓ 17 | 21/9/2012 | 12th Tango 60 km Ultramarathon | 60,00 | ×1 |
| ✓ 18 | 20/5/2012 | 16th 50 km Ultramarathon Ako Seaside Park | 50,00 | ×1 |