Prime p₀= 215999449947030611 starts a Symmetric tuple of 20 consecutive primes (SPT).
d_n: 0 8 4 18 8 30 4 6 2 42 34 42 2 6 4 30 8 18 4 8 (?)
a_n: 0 8 12 30 38 68 72 78 80 122 156 198 200 206 210 240 248 266 270 278
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: 278
derived by truncating larger tuple
Found by: desktop64
db: batch=69, k=20, 8 4 18 8 30 4 6 2 42 34

SPT(14)	215999391208496179	0 30 40 138 144 148 154 198 204 208 214 312 322 352	-58738534432
SPT(14)	215999392931327869	0 24 54 84 168 178 184 204 210 220 304 334 364 388	-57015702742
SPT(14)	215999427399447737	0 26 92 96 122 126 174 212 260 264 290 294 360 386	-22547582874
SPT(14)	215999436042694237	0 36 64 112 126 142 150 196 204 220 234 282 310 346	-13904336374
TPT(12)	215999442005520071	0 2 6 8 90 92 108 110 120 122 150 152	-7941510540
SPT(22)	215999449947030557	0 54 62 66 84 92 122 126 132 134 176 210 252 254 260 264 294 302 320 324 332 386	-54
SPT(14)	215999452247443133	0 14 44 54 68 96 104 120 128 156 170 180 210 224	2300412522
SPT(14)	215999456836536479	0 2 8 12 14 54 72 80 98 138 140 144 150 152	6889505868
SPT(14)	215999487605180677	0 30 34 72 82 84 90 94 100 102 112 150 154 184	37658150066
SPT(14)	215999493657946573	0 18 40 58 70 100 108 130 138 168 180 198 220 238	43710915962
SPT(16)	215999525454602579	0 8 18 42 44 60 114 132 170 188 242 258 260 284 294 302	75507571968
STPT(10)	215999526051666629	0 2 18 20 30 32 42 44 60 62	76104636018