Prime p₀= 2556855200692601561 starts a Symmetric tuple of 20 consecutive primes (SPT).
d_n: 0 2 6 52 66 14 6 42 10 12 8 12 10 42 6 14 66 52 6 2 (?)
a_n: 0 2 8 60 126 140 146 188 198 210 218 230 240 282 288 302 368 420 426 428
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: 428
derived by truncating larger tuple
Found by: [SG-FC] hl
db: batch=82, k=20, 2 6 52 66 14 6 42 10 12 8

STPT(10)	2556853944376649969	0 2 18 20 30 32 42 44 60 62	-1256315951592
SPT(16)	2556854125818872617	0 34 36 84 96 100 136 156 160 180 216 220 232 280 282 316	-1074873728944
STPT(10)	2556854562798882947	0 2 12 14 42 44 72 74 84 86	-637893718614
STPT(10)	2556854648231934077	0 2 24 26 42 44 60 62 84 86	-552460667484
STPT(10)	2556854764892562227	0 2 30 32 60 62 90 92 120 122	-435800039334
SPT(22)	2556855200692601539	0 22 24 30 82 148 162 168 210 220 232 240 252 262 304 310 324 390 442 448 450 472	-22
STPT(10)	2556855413562693497	0 2 72 74 102 104 132 134 204 206	212870091936
SPT(16)	2556855454214730719	0 8 14 24 102 114 144 164 198 218 248 260 338 348 354 362	253522129158
SPT(16)	2556855861659745791	0 6 12 26 38 62 68 90 98 120 126 150 162 176 182 188	660967144230
STPT(10)	2556856080752583497	0 2 24 26 42 44 60 62 84 86	880059981936
STPT(10)	2556856913662650407	0 2 12 14 42 44 72 74 84 86	1712970048846
STPT(10)	2556857211328384631	0 2 6 8 18 20 30 32 36 38	2010635783070