Smallest Cunningham chains of a given length. Numbers in red indicate smallest known, as opposed to smallest, and numbers in bold are those I have found personally.
See Dirk Augustin's Cunningham chain page for more Cunningham chain records — previously known chains taken from there.
| Length | Type | First prime in chain | Digits | Found by |
|---|---|---|---|---|
| 19 | 1st | |||
| 2nd | 42008163485623434922152331 | 26 | Chermoni and Wroblewski, March 2014 | |
| 18 | 1st | 776208125345634679522109 | 24 | Armitage, January 2021 |
| 2nd | 773377687199227745520601 | 24 | Armitage, January 2021 | |
| 17 | 1st | 2759832934171386593519 | 22 | Wroblewski, May 2008* |
| 2nd | 8058978143544782179441 | 22 | Armitage, January 2021 |
* Proved smallest by Sorenson and Webster, Two algorithms to find primes in patterns, Section 4.3 (arXiv).