| History of Cunningham Chain length 15 | |||
| Initial prime number | Digits | When | Discoverer |
|---|---|---|---|
| 1st kind | |||
| 14354792166345299956567113728 • 43# − 1 | 45 | 1 Jan 2016 | Andrey Balyakin |
| 14366587870229772953764096 • 43# − 1 | 42 | 17 Dec 2015 | Andrey Balyakin |
| 27353790674175627273118204975428644651729 | 41 | 25 Apr 2014 | Jaroslaw Wroblewski |
| 662311489517467124375039 | 24 | 29 May 2008 | Jaroslaw Wroblewski |
| 196426752643710966405599 | 24 | 28 May 2008 | Jaroslaw Wroblewski |
| 11993367147962683402919 | 23 | Oct 2004 | Torbjörn Alm, Jens Kruse Andersen, Primo |
| 4678714760875524493409 | 22 | Sep 2003 | Tony Forbes |
| 2nd kind | |||
| 1932144234211304994 • 71# / 31 + 1 | 44 | 4 May 2026 | Serge Batalov |
| 67040002730422542592 • 53# + 1 | 40 | 10 Mar 2016 | Andrey Balyakin |
| 25939635974573655642 • 53# + 1 | 39 | 15 May 2015 | Andrey Balyakin |
| 28320350134887132315879689643841 | 32 | 17 Jun 2008 | Jaroslaw Wroblewski |
| 71838292723844326926417601 | 26 | 12 Jun 2008 | Jaroslaw Wroblewski |
| 5830768257311375388822241 | 25 | 10 Jun 2008 | Jaroslaw Wroblewski |
| 2817673877915370357723841 | 25 | 5 Jun 2008 | Jaroslaw Wroblewski |
| 105998574608115401372161 | 24 | 26 May 2008 | Jaroslaw Wroblewski |
| 31490080810014733206301 | 23 | 25 May 2008 | Jaroslaw Wroblewski |
| 54269795934721528591 | 20 | Sep 1997 | Tony Forbes |