Prime p₀= 2121398663786720753 starts a Symmetric tuple of 13 consecutive primes (SPT).
d_n: 0 18 6 30 24 30 36 36 30 24 30 6 18 (?)
a_n: 0 18 24 54 78 108 144 180 210 234 264 270 288
All 13 integers p_n = p₀+a_n = p_n-1+d_n are prime and there are no other primes in the gaps.
diameter: 288
Found by: Dirk Broer
db: batch=80, k=13, 18 6 30 24 30 36

SPT(16)	2121396869722317349	0 18 28 54 60 84 88 208 354 474 478 502 508 534 544 562	-1794064403404
STPT(10)	2121396960401692997	0 2 90 92 102 104 114 116 204 206	-1703385027756
STPT(10)	2121397606936892951	0 2 6 8 18 20 30 32 36 38	-1056849827802
SPT(16)	2121397953444776689	0 4 18 28 34 48 118 144 154 180 250 264 270 280 294 298	-710341944064
SPT(16)	2121397981753179751	0 10 40 48 58 70 96 100 108 112 138 150 160 168 198 208	-682033541002
SPT(16)	2121398549892205811	0 6 42 90 120 152 170 210 308 348 366 398 428 476 512 518	-113894514942
SPT(16)	2121399124189298483	0 6 18 48 54 110 134 204 290 360 384 440 446 476 488 494	460402577730
SPT(16)	2121399218414635979	0 24 54 92 122 138 158 164 198 204 224 240 270 308 338 362	554627915226
STPT(10)	2121399235703466539	0 2 18 20 30 32 42 44 60 62	571916745786
SPT(16)	2121399321871374709	0 10 108 154 184 198 202 220 222 240 244 258 288 334 432 442	658084653956
SPT(16)	2121399818177431247	0 2 14 32 36 54 74 84 212 222 242 260 264 282 294 296	1154390710494