| History of Cunningham Chain length 16 | |||
| Initial prime number | Digits | When | Discoverer |
|---|---|---|---|
| 1st kind | |||
| 5201553456122611142 • 41# / 31 − 1 | 32 | 12 May 2026 | Serge Batalov |
| 5321891267768815597571403689 | 28 | 1 May 2026 | Serge Batalov |
| 1519366413426959891612255579 | 28 | 3 Mar 2026 | Nenad Mićić |
| 1320949673086184836637522579 | 28 | 30 Apr 2026 | Serge Batalov |
| 1160991257424047627042291969 | 28 | 3 Mar 2026 | Nenad Mićić |
| 977690418800553577229660549 | 27 | 4 Mar 2026 | Nenad Mićić |
| 966078334521526119113207129 | 27 | 3 Mar 2026 | Nenad Mićić |
| 929045505808475001179907959 | 27 | 25 Feb 2026 | Nenad Mićić |
| 870963680329652569998937169 | 27 | 4 Mar 2026 | Nenad Mićić |
| 821328578318444235588205799 | 27 | 11 Mar 2026 | Nenad Mićić |
| 785618792242947536162439149 | 27 | 11 Mar 2026 | Nenad Mićić |
| 775966431281979185226148169 | 27 | 3 Mar 2026 | Nenad Mićić |
| 769839185573703284174253689 | 27 | 3 Mar 2026 | Nenad Mićić |
| 664870017491412573885064019 | 27 | 1 May 2026 | Serge Batalov |
| 648018276632351634227983049 | 27 | 3 Mar 2026 | Nenad Mićić |
| 594081376113834138362169479 | 27 | 27 Feb 2026 | Nenad Mićić |
| 557938724861567182708043039 | 27 | 3 Mar 2026 | Nenad Mićić |
| 463566910452262787501309549 | 27 | 4 Mar 2026 | Nenad Mićić |
| 414259833282625894113757349 | 27 | 17 Mar 2026 | Nenad Mićić |
| 267348405575200786541669249 | 27 | 25 Feb 2026 | Nenad Mićić |
| 226224830825899032358605659 | 27 | 14 Mar 2026 | Nenad Mićić |
| 226195187987904205395038999 | 27 | 11 Mar 2026 | Nenad Mićić |
| 226168068957874945008547439 | 27 | 11 Mar 2026 | Nenad Mićić |
| 202382671094372608956534989 | 27 | 11 Mar 2026 | Nenad Mićić |
| 193430119912334968016704349 | 27 | 11 Mar 2026 | Nenad Mićić |
| 190471309744071730747341539 | 27 | 11 Mar 2026 | Nenad Mićić |
| 185998402316638791276415589 | 27 | 11 Mar 2026 | Nenad Mićić |
| 181546916972622257139720779 | 27 | 11 Mar 2026 | Nenad Mićić |
| 178582844457734385078438599 | 27 | 14 Mar 2026 | Nenad Mićić |
| 178565601698674762947349259 | 27 | 11 Mar 2026 | Nenad Mićić |
| 175579519244180280934989569 | 27 | 11 Mar 2026 | Nenad Mićić |
| 172647200918680966306102559 | 27 | 14 Mar 2026 | Nenad Mićić |
| 163719455634931520079760289 | 27 | 14 Mar 2026 | Nenad Mićić |
| 163681405758637498729341629 | 27 | 11 Mar 2026 | Nenad Mićić |
| 160753925122055205107013989 | 27 | 14 Mar 2026 | Nenad Mićić |
| 96433114911586920715852889 | 26 | 14 Mar 2026 | Nenad Mićić |
| 93750943017609113419982369 | 26 | 11 Mar 2026 | Nenad Mićić |
| 92263431931171439626291889 | 26 | 11 Mar 2026 | Nenad Mićić |
| 89299635869587579511245169 | 26 | 14 Mar 2026 | Nenad Mićić |
| 80387775720870073909372919 | 26 | 17 Mar 2026 | Nenad Mićić |
| 53683220892471323923778579 | 26 | 4 Mar 2026 | Nenad Mićić |
| 841180459385809052143919 | 24 | 20 Feb 2026 | Dmitry Petukhov |
| 224322726987485842510079 | 24 | 13 Feb 2026 | Dmitry Petukhov |
| 100292904077449393450139 | 24 | 13 Feb 2026 | Dmitry Petukhov |
| 97710627486391365624749 | 23 | 13 Feb 2026 | Dmitry Petukhov |
| 91304653283578934559359 | 23 | 29 May 2008 | Jaroslaw Wroblewski |
| 85289834855728268105339 | 23 | 11 Mar 2026 | Nenad Mićić |
| 80501794925668093297319 | 23 | 6 Mar 2026 | Nenad Mićić |
| 72581911833484356800639 | 23 | 6 Mar 2026 | Nenad Mićić |
| 48405305300431837925309 | 23 | 13 Feb 2026 | Dmitry Petukhov |
| 43846588698763773419639 | 23 | 6 Mar 2026 | Nenad Mićić |
| 41085553335860856416879 | 23 | 13 Feb 2026 | Dmitry Petukhov |
| 37350533474156839240589 | 23 | 13 Feb 2026 | Dmitry Petukhov |
| 34104543009192853055429 | 23 | 11 Mar 2026 | Nenad Mićić |
| 23789912813928437606429 | 23 | 4 Mar 2026 | Nenad Mićić |
| 19731832584254856775709 | 23 | 13 Feb 2026 | Dmitry Petukhov |
| 15563183110962606439319 | 23 | 6 Mar 2026 | Nenad Mićić |
| 13082771064950120292329 | 23 | 6 Mar 2026 | Nenad Mićić |
| 12836302205351714467949 | 23 | 6 Mar 2026 | Nenad Mićić |
| 9231096987009854423609 | 22 | 6 Mar 2026 | Nenad Mićić |
| 8956085527831026421979 | 22 | 6 Mar 2026 | Nenad Mićić |
| 5974569393059198161229 | 22 | 6 Mar 2026 | Nenad Mićić |
| 4225162462504439720549 | 22 | 6 Mar 2026 | Nenad Mićić |
| 892390227741617675069 | 21 | Feb 2002 | Phil Carmody; Paul Jobling |
| 857721307911217918739 | 21 | 13 Feb 2026 | Dmitry Petukhov |
| 2nd kind | |||
| 109114927349041124 • 41# / 31 + 1 | 31 | 17 May 2026 | Serge Batalov |
| 10009554284404305440084855581 | 29 | 2 May 2026 | Serge Batalov |
| 3081594850735522012277717761 | 28 | 9 Mar 2014 | Raanan Chermoni; Jaroslaw Wroblewski |
| 2632756390435247768817290881 | 28 | 3 Apr 2014 | Raanan Chermoni; Jaroslaw Wroblewski |
| 2614065594356962781728904641 | 28 | 9 Apr 2014 | Raanan Chermoni; Jaroslaw Wroblewski |
| 2368823992523350998418445521 | 28 | 26 Jun 2008 | Jaroslaw Wroblewski |
| 20193491108493165642344881 | 26 | 12 Jun 2008 | Jaroslaw Wroblewski |
| 2604625393310788673276881 | 25 | 10 Jun 2008 | Jaroslaw Wroblewski |
| 258296136493222766530021 | 24 | 8 Jun 2008 | Jaroslaw Wroblewski |
| 255612149111215340189461 | 24 | 5 Jun 2008 | Jaroslaw Wroblewski |
| 15745040405007366603151 | 23 | 25 May 2008 | Jaroslaw Wroblewski |
| 14856715643943740312461 | 23 | 11 Mar 2026 | Nenad Mićić |
| 9285880921746261428311 | 22 | 6 Mar 2026 | Nenad Mićić |
| 8826685968595102329151 | 22 | 6 Mar 2026 | Nenad Mićić |
| 5863271426042376347431 | 22 | 6 Mar 2026 | Nenad Mićić |
| 4182364807731124927771 | 22 | 6 Mar 2026 | Nenad Mićić |
| 3317701081761359328751 | 22 | 6 Mar 2026 | Nenad Mićić |
| 3203000719597029781 | 19 | 5 Dec 1997 | Tony Forbes First known ! |