Bi-twin chain length 8 - history
n = 0 → base twin prime n's  Digits  When Discoverer
10739718035045524715 • 13# • 2n ± 1 0..7 24+ Dec 2008 Jaroslaw Wroblewski
3121841089757408395 • 13# • 2n ± 1 0..7 23+ Dec 2008 Jaroslaw Wroblewski
517144126484002331 • 13# • 2n ± 1 0..7 23+ May 2004 Hans Rosenthal & Jens K. Andersen
53780914344409189 • 13# • 2n ± 1 0..7 22+ Dec 2008 Jaroslaw Wroblewski
21033215071024191 • 13# • 2n ± 1 0..7 21+ Feb 2002 Paul Jobling & Phil Carmody