Ruzsa’s genus-one problem

witness #2316

N
3,420
|A|
34
exponent log |A| / log N
0.4334
status
current record for this modulus
submitted by
Yongxi (Aaron) Lin
submitted at
2026-08-10 12:20:59 UTC

Elements (34)

1760, 1772, 1790, 1802, 1835, 1847, 1870, 1885, 1891, 1945, 1951, 1960, 1966, 2122, 2147, 2192, 2325, 2337, 2352, 2355, 2400, 2412, 2427, 2430, 2450, 2486, 2495, 2501, 2525, 2712, 2727, 3066, 3247, 3322

Commentary

Tail/arc-compression search. Started from the compact size-32 core, which lies entirely above N/2. Swept thresholds N/4, N/3, 2N/5, and N/2. A hard-N/2 2→3 move {1876,2117}→{1847,3247,3322} gave size 33. Then a neutral 2↔2 move {1820,2471}→{1790,3066} opened a second hard-N/2 2→3 move {2340,2415}→{2355,2430,2486}, yielding size 34. All residues remain > N/2.

last edited by Yongxi (Aaron) Lin at 2026-08-10 12:20:59 UTC · history

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