Prime p₀= 1954721387974178311 starts a Symmetric tuple of 18 consecutive primes (SPT).
d_n: 0 28 18 42 8 12 4 20 6 22 6 20 4 12 8 42 18 28 (?)
a_n: 0 28 46 88 96 108 112 132 138 160 166 186 190 202 210 252 270 298
All 18 integers p_n = p₀+a_n = p_n-1+d_n are prime and there are no other primes in the gaps.
diameter: 298
Found by: ChUcK
db: batch=80, k=18, 28 18 42 8 12 4 20 6 22

SPT(16)	1954720316365222379	0 2 18 24 42 84 108 120 122 134 158 200 218 224 240 242	-1071608955932
STPT(10)	1954720363089343247	0 2 30 32 72 74 114 116 144 146	-1024884835064
STPT(10)	1954720522476321569	0 2 12 14 30 32 48 50 60 62	-865497856742
SPT(16)	1954720551171552239	0 12 20 54 78 98 122 132 140 150 174 194 218 252 260 272	-836802626072
SPT(16)	1954720803472869701	0 38 96 128 146 152 168 210 218 260 276 282 300 332 390 428	-584501308610
SPT(16)	1954721335857044099	0 8 20 42 48 74 104 158 174 228 258 284 290 312 324 332	-52117134212
STPT(10)	1954721621913427361	0 2 36 38 78 80 120 122 156 158	233939249050
STPT(10)	1954721746437424577	0 2 30 32 42 44 54 56 84 86	358463246266
STPT(10)	1954721981099537327	0 2 12 14 42 44 72 74 84 86	593125359016
STPT(10)	1954721989697842637	0 2 24 26 42 44 60 62 84 86	601723664326
SPT(18)	1954722167822126849	0 18 20 42 48 54 80 90 132 200 242 252 278 284 290 312 314 332	779847948538