Prime p₀= 1977377767395557249 starts a Symmetric tuple of 20 consecutive primes (SPT).
d_n: 0 2 36 22 2 66 12 24 34 26 34 26 34 24 12 66 2 22 36 2 (?)
a_n: 0 2 38 60 62 128 140 164 198 224 258 284 318 342 354 420 422 444 480 482
All 20 integers p_n = p₀+a_n = p_n-1+d_n are prime and there are no other primes in the gaps.
diameter: 482
Found by: Dingo
db: batch=80, k=20, 2 36 22 2 66 12 24 34 26 34

SPT(16)	1977376573197248323	0 16 36 46 114 126 156 168 256 268 298 310 378 388 408 424	-1194198308926
TPT(14)	1977376829902913891	0 2 6 8 48 50 60 62 126 128 138 140 156 158	-937492643358
SPT(16)	1977377083090567061	0 30 66 72 78 92 140 182 186 228 276 290 296 302 338 368	-684304990188
TPT(14)	1977377278462162319	0 2 30 32 78 80 108 110 198 200 222 224 408 410	-488933394930
STPT(10)	1977377412173788451	0 2 30 32 78 80 126 128 156 158	-355221768798
SPT(16)	1977377510719748329	0 12 40 58 64 84 90 100 132 142 148 168 174 192 220 232	-256675808920
STPT(10)	1977377913522526127	0 2 30 32 42 44 54 56 84 86	146126968878
TPT(14)	1977378033771706829	0 2 18 20 30 32 48 50 90 92 180 182 222 224	266376149580
STPT(10)	1977378387209478101	0 2 36 38 78 80 120 122 156 158	619813920852
STPT(12)	1977378392706496961	0 2 30 32 60 62 96 98 126 128 156 158	625310939712
SPT(16)	1977378537237074149	0 10 54 112 154 162 184 210 232 258 280 288 330 388 432 442	769841516900