The 20 Largest Known Palindrome
http://primes.utm.edu/top20/page.php?id=53
The Prime Pages keeps a list of the 5000 largest known primes, plus a few each of certain selected archivable forms and classes. These forms are defined in this collection's home page.en-usCopyright 2006, The Prime Pagescaldwell@utm.edu (Dr. Chris K. Caldwell)60010^474500+999*10^237249+1
http://primes.utm.edu/primes/page.php?id=118775
Sun, 16 Nov 2014 12:54:20 -0600This prime has 474501 digits, was found by p363 on 16 Nov 2014. It has rank 1 on the list of Palindrome, and rank 3156 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=11877510^390636+999*10^195317+1
http://primes.utm.edu/primes/page.php?id=118773
Sun, 16 Nov 2014 04:04:27 -0600This prime has 390637 digits, was found by p363 on 16 Nov 2014. It has rank 2 on the list of Palindrome, and rank 6797 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=11877310^362600+666*10^181299+1
http://primes.utm.edu/primes/page.php?id=118770
Sat, 15 Nov 2014 00:31:34 -0600This prime has 362601 digits, was found by p363 on 15 Nov 2014. It has rank 3 on the list of Palindrome, and rank 11366 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=118770Phi(3,10^160118)+(137*10^160119+731*10^159275)*(10^843-1)/999
http://primes.utm.edu/primes/page.php?id=117373
Wed, 05 Mar 2014 18:17:39 -0600This prime has 320237 digits, was found by p44 on 05 Mar 2014. It has rank 4 on the list of Palindrome, and rank 13632 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117373Phi(3,10^160048)+(137*10^160049+731*10^157453)*(10^2595-1)/999
http://primes.utm.edu/primes/page.php?id=117386
Sat, 08 Mar 2014 16:48:53 -0600This prime has 320097 digits, was found by p44 on 08 Mar 2014. It has rank 5 on the list of Palindrome, and rank 13637 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=11738610^314727-8*10^157363-1
http://primes.utm.edu/primes/page.php?id=110658
Mon, 07 Jan 2013 17:21:38 -0600This prime has 314727 digits, was found by p235 on 07 Jan 2013. It has rank 6 on the list of Palindrome, and rank 13952 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=11065810^290253-2*10^145126-1
http://primes.utm.edu/primes/page.php?id=106219
Wed, 11 Apr 2012 05:07:30 -0500This prime has 290253 digits, was found by p235 on 11 Apr 2012. It has rank 7 on the list of Palindrome, and rank 15584 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=106219Phi(3,10^137747)+(137*10^137748+731*10^129293)*(10^8454-1)/999
http://primes.utm.edu/primes/page.php?id=103926
Fri, 13 Jan 2012 16:17:11 -0600This prime has 275495 digits, was found by p44 on 13 Jan 2012. It has rank 8 on the list of Palindrome, and rank 16702 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=10392610^269479-7*10^134739-1
http://primes.utm.edu/primes/page.php?id=105258
Wed, 29 Feb 2012 14:09:31 -0600This prime has 269479 digits, was found by p235 on 29 Feb 2012. It has rank 9 on the list of Palindrome, and rank 17144 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=10525810^223663-454*10^111830-1
http://primes.utm.edu/primes/page.php?id=120863
Thu, 07 Jan 2016 15:32:14 -0600This prime has 223663 digits, was found by p363 on 07 Jan 2016. It has rank 10 on the list of Palindrome, and rank 21041 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=12086310^220285-949*10^110141-1
http://primes.utm.edu/primes/page.php?id=120848
Tue, 05 Jan 2016 17:05:53 -0600This prime has 220285 digits, was found by p363 on 05 Jan 2016. It has rank 11 on the list of Palindrome, and rank 21366 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=12084810^219113-535*10^109555-1
http://primes.utm.edu/primes/page.php?id=120838
Mon, 04 Jan 2016 20:24:37 -0600This prime has 219113 digits, was found by p363 on 04 Jan 2016. It has rank 12 on the list of Palindrome, and rank 21488 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=12083810^214575-20002*10^107285-1
http://primes.utm.edu/primes/page.php?id=120871
Sun, 10 Jan 2016 01:18:03 -0600This prime has 214575 digits, was found by p363 on 10 Jan 2016. It has rank 13 on the list of Palindrome, and rank 21987 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=12087110^214479-535*10^107238-1
http://primes.utm.edu/primes/page.php?id=120827
Sat, 02 Jan 2016 14:45:52 -0600This prime has 214479 digits, was found by p363 on 02 Jan 2016. It has rank 14 on the list of Palindrome, and rank 21997 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=120827Phi(3,10^104279)+(137*10^104280+731*10^93395)*(10^10884-1)/999
http://primes.utm.edu/primes/page.php?id=117318
Thu, 27 Feb 2014 18:15:21 -0600This prime has 208559 digits, was found by p44 on 27 Feb 2014. It has rank 15 on the list of Palindrome, and rank 22695 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117318Phi(3,10^104276)+(137*10^104277+731*10^99683)*(10^4593-1)/999
http://primes.utm.edu/primes/page.php?id=117317
Thu, 27 Feb 2014 16:19:11 -0600This prime has 208553 digits, was found by p44 on 27 Feb 2014. It has rank 16 on the list of Palindrome, and rank 22696 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117317Phi(3,10^104257)+(137*10^104258+731*10^99193)*(10^5064-1)/999
http://primes.utm.edu/primes/page.php?id=117296
Wed, 26 Feb 2014 12:15:13 -0600This prime has 208515 digits, was found by p44 on 26 Feb 2014. It has rank 17 on the list of Palindrome, and rank 22703 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117296Phi(3,10^103289)+(137*10^103290+731*10^90449)*(10^12840-1)/999
http://primes.utm.edu/primes/page.php?id=117111
Sun, 09 Feb 2014 18:03:53 -0600This prime has 206579 digits, was found by p44 on 09 Feb 2014. It has rank 18 on the list of Palindrome, and rank 22948 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117111Phi(3,10^103282)+(137*10^103283+731*10^85009)*(10^18273-1)/999
http://primes.utm.edu/primes/page.php?id=117149
Thu, 13 Feb 2014 09:20:25 -0600This prime has 206565 digits, was found by p44 on 13 Feb 2014. It has rank 19 on the list of Palindrome, and rank 22950 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117149Phi(3,10^103182)+(137*10^103183+731*10^66639)*(10^36543-1)/999
http://primes.utm.edu/primes/page.php?id=117033
Fri, 31 Jan 2014 08:49:30 -0600This prime has 206365 digits, was found by x29 on 31 Jan 2014. It has rank 20 on the list of Palindrome, and rank 22977 on the list of largest known primes.http://primes.utm.edu/primes/page.php?id=117033